Photoperiod Mediates the Effects of Temperature and Light Intensity on the Proliferation of Ulva prolifera

In order to study the complex effects of photoperiod,temperature,and light intensity on the spore maturation and release number of Ulva prolifera,we cultured thalli segment(2–3 mm)under three different photoperiods(L:D=12:12,14:10 and 10:14),temperature(15℃(LT),25℃(MT)and 30℃(HT))and light intensity(100,200 and 400μmol m^(−2)s^(−1),noted as LL,ML and HL,respectively)conditions.Then the maturation time,spore release number and chlorophyll fluorescence were analyzed.The results suggested that:1)The spore maturation time was accelerated by higher temperature or higher light intensity from 62 h to 36 h,and changes in day length accelerated the spore maturation to a certain extent as compared with 12:12 light/dark cycle;2)Higher light intensity significantly decreased the chlorophyll fluorescence(Fv′/Fm′,NPQ,rETRmax andα)of the mature reproductive segment under 30℃with 12:12 light/dark cycle.But when in the other photoperiods(10:14 and 14:10 conditions),the inhibitory effects of high light intensity were alleviated significantly;3)The optimum condition for the spore maturation and release was 12:12 light/dark cycle,25℃,400μmol m^(−2)s^(−1),with both shorter and longer photoperiod reducing the spore release number;4)Higher light intensity significantly increased the spore release number under 25℃,but these effects were alleviated by 30℃treatment.This study is the first attempt to elucidate the coincidence effects of photoperiod,temperature and light intensity on the reproduction of Ulva,which would help to reveal the mechanism of the rapid proliferation of green tide.

Regulation of Reproduction in Delayed Gametophyte of Saccharina japonica (Laminariales, Phaeophyceae): Effects of Light Intensity, Quality and Photoperiod

Saccharina japonica gametophytes can survive a long period under unfavorable environmental conditions,while they also delay in growth and/or reproduction.Although the reproduction in delayed gametophyte of S.japonica was known to be strongly influenced by light intensity,light quality,and photoperiod,no previous studies have evaluated their interactive effects on gametogenesis.To evaluate these effects,we used an orthogonal experiment to expose delayed gametophytes of S.japonica to different light intensities,light qualities,and photoperiods for 12 days.The results showed that changes in light intensity rather than light quality and photoperiod significantly affected the relative growth rates of the delayed gametophytes.Blue light had the greatest promotion on reproduction rate.The optimal light conditions in the early vegetative growth phase in gametogenesis induction for the delayed gametophytes were at 60–80μmol photons m^(−2) s^(−1) with daylength of 12 or 16 hours under white or blue light.When the delayed gametophytes were maintained in a constant light condition from delayed state to gametogenesis,the beneficial photoperiods for vegetative growth and reproductive rate were both 16L(16 hours of light):8D(8 hours of dark).However,when the delayed S.japonica gametophytes achieve the optimal growth state during the first 6 days and then they were cultured at different light conditions for the following 6 days,the reproduction rate increased as the daylength decreased and attained a peak value in group of 8L:16D photoperiod,indicating that photoperiod adjustment at the transition period is crucial in the gametogenesis induction process of delayed gametophyte of S.japonica.

Effects of light intensities and photoperiods on growth and proteolytic activity in purple non-sulfur marine bacterium, <i>Afifella marina</i>strain ME (KC205142)

Afifella marina strain ME (KC205142), a purple non-sulfur bacterium was isolated from mangrove habitats of Sabah. The effects of light intensities and photoperiods on proteolytic activity in Afifella marina strain ME (KC205142) were investigated. Secretion of proteolytic enzymes in Afifella marina was preliminarily assessed by skim milk agarose media. Subsequently, light intensities, such as, dark, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500 and 5000 lux were used to evaluate the effects on proteolytic activity in Afifella marina strain ME under anaerobic condition. After that, the effect of photoperiods on proteolytic activity was monitored under anaerobic light condition (3000 lux) at 0 h (0L/24D), 6 h (6L/18D), 12 h (12L/12D), 18 h (18L/6D) and 24 h (24L/0D) of photoperiod. The highest proteolytic activity of 74.67 U was recorded at 3000 lux illumination light intensity. The proteolytic activity in bacterium Afifella marina strain ME was positively associated with the dry cell weight. The proteolytic activity of 72.67 U in bacterium Afifella marina strain ME at 18 h (18L/6D) photoperiod is not significantly different (p > 0.05) from proteolytic activity of 74.67 U recorded at continuous light (24L/0D) condition. Light intensity of 3000 lux, culture period of 48 h and a photoperiod of 18 h (18L/ 6D) were the optimum parameters for proteolytic activity in bacterium Afifella marina strain ME.

温室园艺LED照明研究与应用现状

LED作为设施园艺光环境调控的优选光源和手段,节能、精准、长寿命且光效率高,可通过光质及其光强和光周期等光照属性的控制,调控植物光合作用和光形态建成,调节设施园艺作物生长发育、生物量和果实产量、开花及农产品品质,获得温室补光的效益。而且,基于时空光环境调控带来的显著效益,动态照明和立体照明应运而生,方兴未艾,应用前景广阔。本文总结了温室LED照明产品和应用领域,提出了动态照明和立体照明技术概念,总结了光质、光强和光周期植物调控的研究进展,重点阐述了光质调控植物园艺作物生长发育、产量、开花及农产品品质的研究进展,对未来温室LED补光产业发展前景进行了展望。

光调控对药用植物次生代谢成分合成的影响

药用植物次生代谢成分,因具有特殊的药理活性或功效对人类的健康极为重要,是药品、保健品、化妆品的主要来源。随着人类对于健康和长寿的不断追求,医药市场的需求规模持续增长,提高药用植物次生代谢成分的产量和质量变得特别重要。植物次生代谢成分是植物对环境的一种适应,是在长期进化过程中植物与生物和非生物因素相互作用的结果。药用植物次生代谢成分的产生和积累主要受植物遗传因素和环境因素的影响,其中光环境对其合成影响尤为重要,因而,长期以来光调控一直是国内外众多学者研究的热点。本文综述近年来有关光调控对药用植物次生代谢成分影响的研究进展,主要从光质、光强、光周期的影响分别阐述,以期为高效生产具有重要药理活性的次生代谢成分提供理论依据和实践指导。

全面供光策略调控废水培养光合细菌产单细胞蛋白

为拓展蛋白质来源,缓解中国饲料蛋白资源短缺现状,该研究通过供光策略调控强化了沼泽红假单胞菌(R.palustris)从废水中回收菌体资源及单细胞蛋白(single cell protein, SCP)的效果,并解析了不同供光策略下物质合成与污染物降解之间的相关性。结果表明:在白炽灯、120μmol/(m^(2)·s)的光强及18 h光/6 h暗(L/D)的光周期条件下菌体的生物量及日产量可达(1 140.56±19.72) mg/L及(0.32±0.02) g/(L·d),相较于24 L/0 D、 3 L/21 D及9 L/15 D组分别提高了17.06%~93.21%、54.43%~299.93%(P<0.05);在白炽灯、120 μmol/(m^(2)·s)的光强及3 h光/21 h暗的光周期条件下,菌体的蛋白质质量分数最高,为67.47%,相较于其他所有试验组提高了21.96%~44.54%(P<0.05)。化学需氧量(chemical oxygen demand, COD)和氨氮(ammonia nitrogen, NH_(4)^(+)-N)去除率在白炽灯、120 μmol/(m^(2)·s)的光强及18 h光/6 h暗的光周期条件下可达72.03%~78.40%。相关性分析表明,光强、光质分别与蛋白质含量及浓度呈显著负相关;而光周期与蛋白质浓度呈显著正相关,因此,光周期是R. palustris从废水体系中提升SCP产量的有效调控方法。该研究为提高废水体系中光合细菌合成SCP提供了新的方法与思路。

光照对家禽生产性能的影响及调控机制研究进展

光照作为环境的重要组成部分,可通过光感受器调控家禽的神经内分泌系统,进而影响其生长发育、繁殖性能。近年来,国内外研究者研究发现家禽养殖过程中,合理利用光照可提升家禽的生产性能与经济效益。文章就光照来源、光照波长、光照强度、光周期对家禽的影响及其调控机制进行概述,以期为家禽生产中合理利用光照提供理论参考。

光照调控植物多酚类物质合成的研究进展

植物多酚是植物体内具有多元酚结构的一类复杂的酚类次生代谢物,能够应对生物和非生物胁迫引起的氧化损伤,因此在植物生长发育过程中具有重要的作用。光照对植物的生长发育及多酚类物质合成具有至关重要的影响,其主要通过调控苯丙烷等代谢途径基因影响多酚类物质的合成。简述了多酚类物质的合成途径,并从光周期、光照强度以及光质三方面总结光照对多酚类物质合成的影响,旨在为今后多酚类物质的调控机制提供理论基础。

光照在肉鸽养殖中的应用研究进展

肉鸽的生长发育以及繁殖性能受到诸多环境因素的影响,其中光照是关键因素之一。目前肉鸽养殖中的光照制度尚无统一标准,多借鉴于鸡。文章通过对国内外相关文献的搜集,阐述了肉鸽不同生产阶段不同光照制度(时长、波长、强度)对生长性能、繁殖性能等的应用效果,可为肉鸽生产中科学合理地应用人工光照提供理论依据和参考,从而进一步推动鸽养殖业健康高效发展。

不同光照对砂仁生长影响的研究进展

主要介绍光环境(光照强度、光质和光周期)对砂仁开花、花期、落果等生长方面的影响。光照强度达到400μmol/(m^(2)·s)后,砂仁光合速率趋于最大值。相对于其他光质,蓝光可以促进砂仁的生长。使用红光或者低比例的红光和远红光对植物体内的赤霉素合成具有调控作用,可为砂仁保果技术提供一个研究的方向。

Study of light signal receptor of Stephanopyxis palmeriana during sexual reproduction

We collected centric diatom Stephanopyxis palmeriana samples in coastal waters of Xiamen for charac- teristic red light/far red light (R/FR) phytochrome reactions to identify its photoreceptor in the course of sexual repro- duction. The result showed that pre-illumination of 2-3h red light before darkness could induce sexualization of S. palmeriana, while the follow-up illumination of far red light could reverse the effect of red light, which is a featured reaction of phytochrome. The Southern Dot Blot was carried out to identify the type of phytochrome that induces the sexualization. The result also showed high homogeneity of DNA fragment of S. palmeriana with phyB, but phyA. This means the photoreceptor in the process of sexual reproduction of S. palmeriana is phytochrome B (phyB).

间歇供光模式下光照度和光周期对水培臭菜生长和品质的影响

为了探究间歇供光模式下,LED红蓝灯光照度与光周期对水培臭菜生长特性及营养品质的影响,设置了4种光照度(幼苗期/生长期):100μmol·m^(-2)·s^(-1)/300μmol·m^(-2)·s^(-1)、150μmol·m^(-2)·s^(-1)/300μmol·m^(-2)·s^(-1)、200μmol·m^(-2)·s^(-1)/250μmol·m^(-2)·s^(-1)、250μmol·m^(-2)·s^(-1)/250μmol·m^(-2)·s^(-1)和3种光周期梯度5 h/7 h、6 h/6 h、7 h/5 h,采用双因素完全随机试验对臭菜进行水培,共12组处理。结果表明,水培臭菜在光周期7 h/5 h,光照度(幼苗期/生长期)为250μmol·m^(-2)·s^(-1)/250μmol·m^(-2)·s^(-1)条件下可溶性蛋白含量最高。但综合考虑能源消耗与经济价值,水培臭菜在光暗周期7 h/5 h,以及光照度(幼苗期/生长期)200μmol·m^(-2)·s^(-1)/250μmol·m^(-2)·s^(-1)的条件下鲜质量最大,维生素C含量高(0.43 mg·g^(-1)),且30 d总耗能仅为47.0 kW·h,因此可以作为综合最优生产方案。研究结果对水培臭菜的智能植物工厂化生产具有一定的参考意义。

光照对雾培马铃薯前期生长及块茎形成的影响

[目的]本研究旨在明确不同光照条件对雾培马铃薯块茎形成初期植株生长、块茎形成及其相关基因表达的影响。[方法]以马铃薯品种‘中薯18号’和‘中薯早35’为材料,选取接种3周长势一致的脱毒试管苗,设置2个光照周期[12 h/12 h(P1)、16 h/8 h(P2)]和3个光照强度[150μmol·m-2·s-1(L1)、350μmol·m-2·s-1(L2)和550μmol·m-2·s-1(L3)]共6个试验组合:P1L1、P1L2、P1L3、P2L1、P2L2和P2L3。取样测定生长和光合指标及相关基因的表达。[结果]P1条件下,2个品种的净光合速率、地上部生物量、地下部生物量、匍匐茎数、单株块茎数和单株产量从高到低的处理依次为P1L3、P1L2、P1L1;P1L3处理加速了‘中薯18号’和‘中薯早35’的块茎形成,分别比P1L1、P1L2处理提早了10.3、3.1 d和7.4、4.2 d。匍匐茎发生期和膨大期StPHYF、StCO1、StSP6A以及StSWEET-1基因在叶片和匍匐茎中的表达量也随光照强度的增加显著上升。P2L2与P2L3处理2个品种净光合速率无明显差异,但都显著高于P2L1。P2处理的2品种地上部生物量、地下部生物量、匍匐茎数随光照强度增强而增加,且显著高于P1。长日照显著抑制了2个品种块茎的形成,与P1L1、P1L2和P1L3相比,P2L1、P2L2和P2L3处理‘中薯18号’和‘中薯早35’块茎形成时间分别推迟了22.3、12.8和13.7 d以及12.4、3.7和3.6 d,并使StPHYF、StCO1在叶片和匍匐茎中表达上调,StSP6A和StSWEET-1的表达被显著抑制。[结论]生产上在较高光照强度下可采用前期长日壮苗促进匍匐茎发生,中后期短日诱导促进块茎形成的方法提高雾培马铃薯生产效率。

不同光强和光周期对山药珠芽生长发育的影响

为了解不同光照强度和光周期对珠芽生长发育的影响,本研究采用3种光强和5种时长对山药茎段外植体进行离体培养。结果表明,珠芽的发育与光合有效辐射的积累有关,强光[195μmol/(m^(2)·s)]下短时间光照及弱光[20μmol/(m^(2)·s)]下长时间光照均能满足珠芽生长需求,强光整体抑制生长,弱光较中等光强[95μmol/(m^(2)·s)]生长较慢,并且在各光强下4 h/d光周期均不能满足珠芽快速伸长的需要,16 h/d光照不同程度的抑制珠芽伸长,而每天8 h和10 h光照时长适宜珠芽的生长,珠芽数量最多;珠芽表皮对光照极为敏感,在弱光条件下亦能变为褐色;弱光和短日照条件显著促进珠芽须根的生长;光强是影响珠芽出芽的重要因素,受光周期的调控较弱。综合来看,根据培养目的的不同应选择相应的光照环境,如为促进珠芽伸长获得更高质量的珠芽可选择光强95μmol/(m^(2)·s)光照8 h或10 h,抑制生根和萌发可采用195μmol/(m^(2)·s)光照12 h或16 h,提高发芽率和促进须根生长可选用20μmol/(m^(2)·s)照射4~12 h。

光因子对方斑东风螺胚胎和幼虫发育的影响

为研究光因子对方斑东风螺胚胎受精孵化过程的影响,实验采用析因实验设计法研究了光照强度、光质和光周期等不同光条件对方斑东风螺胚胎发育过程中受精率(FR)、孵化率(HR)和变态率(MR)的影响,通过回归模型,优化光条件,找到利于胚胎发育的最佳光质、光强和光周期。结果显示,不同光质条件下,光照强度和光周期一次效应、交互效应和二次效应均呈显著水平,三者存在互作效应。在绿光条件下,光照强度为13.70μmol/(m^(2)·s),光照时间为15.54 h时,其FR、HR和MR达到最优值,其值分别为91.36%、88.64%和92.02%,优化后绿光促进东风螺胚胎发育效果最为明显,其次是红光和白光。在蓝光条件下,其光照强度和光周期任意组合水平下FR、HR和MR与其他光质比较均较低,且随着光照强度增加和光照时间延长,三项指标值下降越明显,因而表明蓝光对胚胎发育起到抑制作用。实验表明,合适的光照强度和光周期能与光质协同作用,可以提高方斑东风螺育苗效率和苗种品质。

光质和光周期对山白兰苗木生长、生理的影响

为筛选出山白兰(Michelia baillonii)苗木培育过程中适宜的光环境,该研究以一年生山白兰幼苗为试验材料,设置12、16 h·d^(-1)两个光周期,配合使用红蓝复合光(8R1B、6R1B)、红蓝紫绿复合光(8R1B1P1G、6R1B1P1G)4种光质和白光(W)对照,采用双因素随机区组试验设计和隶属函数法,探讨了山白兰苗木生长、光合色素、内源激素含量对不同光质和光周期处理的响应规律。结果表明:(1)光质、光周期及其交互作用对山白兰苗高增长量、叶面积、叶绿素a、玉米素(ZR)、脱落酸(ABA)的含量、内源激素比值[IAA/ABA、(IAA+GA_(3)+ZR)/ABA]等均有显著影响(P<0.05)。(2)16 h·d^(-1)光周期有利于苗高增长量、叶面积、苗木质量指数、生物量、叶绿素a、生长素(IAA)、ZR的含量、内源激素比值的提高。(3)当光周期为16 h·d^(-1)时,8R1B处理下的苗高增长量、叶面积和苗木质量指数均最大,分别为21.84 cm、158.39 cm~2和2.43;8R1B处理下的叶绿素a/b比值、ZR含量高于6R1B处理,8R1B1P1G处理下的叶绿素a、类胡萝卜素、IAA、赤霉素(GA_(3))的含量、叶绿素a/b、内源激素的比值较6R1B1P1G处理大。综上所述,较高比例红光的红蓝复合光质、适当延长光周期有利于提高山白兰苗木质量,而紫绿光的添加未对生长有促进效果,16 h·d^(-1)×8R1B处理是最适宜山白兰苗木生长的光照条件。

光周期和光质对红砂幼苗生长及光化学反应的影响

本文以1年生红砂(Reaumuria soongorica)幼苗为研究对象,采用LED灯为光源,设置5个光质(红光、黄光、蓝光、绿光、白光),每个光质设置3个光周期梯度(12L/12D,14L/10D,16L/8D),探讨了不同光周期和不同光质对红砂幼苗生长和叶片光化学反应的响应特征。测定其相对生长速率(Relative growth rate,RGR)生物量积累、光合色素含量和叶绿素荧光参数,筛选适合红砂幼苗生长的光质光周期组合。结果表明:(1)长光周期16L/8D红光下红砂幼苗的RGR、茎、叶生物量、叶绿素含量、ETR和ΦSII均最高;(2)长光周期16L/8D白光下红砂幼苗的类胡萝卜素含量和F v/F m最高;(3)16L/8D黄光下根冠比和NPQ最高且对红砂幼苗生长呈抑制作用;(4)综合所有指标表现,光周期光质组合为16L/8D红光更具有促进红砂幼苗生长和光合作用的潜力。

不同光质的光周期对青蒜苗生长、光合特性及蔗糖合酶活性的影响

为寻找适宜青蒜苗生长的光环境,以民乐紫皮大蒜为培养材料,设置短光照(12 h光照/12 h黑暗)和长光照(18 h光照/6 h黑暗)2种光周期,每种光照期分别设置白光、白光+红光、白光+蓝光、白光+红蓝混光4种光质,共8个光周期组合:12 h白光/12 h黑暗(12W/12D)、6 h白光+6 h红光/12 h黑暗(6W+6R/12D)、6 h白光+6 h蓝光/12 h黑暗(6W+6B/12D)、6 h白光+6 h(红光+蓝光)/12 h黑暗(6W+6(R+B)/12D)和18 h白光/6 h黑暗(18W/6D)、6 h白光+12 h红光/6 h黑暗(6W+12R/6D)、6 h白光+12 h蓝光/6 h黑暗(6W+12B/6D)、6 h白光+12 h红蓝混光/6 h黑暗(6W+12(R+B)/6D),测定其对青蒜苗生长和光合特性及蔗糖磷酸合酶(SPS)活性的影响。结果表明:(1)与短光照光周期相比,长光照光周期处理的青蒜苗叶长、假茎长和C _(i)分别降低17.66%、16.38%和20.38%(P<0.05),其中18W/6D处理降低最多,降幅分别为25.88%、27.12%和35.25%;长光照光周期处理的叶宽增加11.19%(P<0.05),但光质及其组合对叶宽无显著影响(P>0.05);长光照光周期处理的假茎叶鲜质量、叶绿素相对含量(SPAD值)、叶绿素最小荧光强度(F _(o))、PSⅡ的最大量子产额(F _(v)/F _(m))、潜在光化学效率(F _(v)/F _(o))、净光合速率(P _(n))和SPS活性分别显著增加20.70%、8.55%、11.27%、8.64%、7.91%、118.07%和43.65%(P<0.05),其中6W+12(R+B)/6D处理增幅最大(P<0.05),分别增加40.37%、19.16%、19.32%、19.75%、26.37%、192.90%和84.04%。(2)与纯白光照光周期相比,其他各光周期均显著提升叶片G _(s)和Rubisco活性(P<0.05),其中6W+12(R+B)/6D提升幅度最大,分别较12W/12D提高96.56%和230.56%,较18W/6D提高94.54%和221.62%。(3)与12W/12D相比,其他各光周期处理假茎粗显著增加(P<0.05),为12W/12D的1.17倍,但各光周期间无显著差异(P>0.05)。综上,长光照会抑制青蒜苗假茎和叶伸长生长,但促进假茎的加粗生长,使蒜苗的鲜质量增加;蓝光和红光对青蒜苗生长、叶片光合特性以及与光合产物形成和转运相关的Rubisco和SPS有显著促进作用;蓝光和红光混合有增效作用,较长时间混合光照增效作用更明显。

Effects of light intensity and photoperiod on the growth and stress response of juvenile Nile tilapia(Oreochromis niloticus)in a recirculating aquaculture system

Light is an essential natural factor of fish growth and development.A light regime in indoor aquaculture is critical for sustainable fish production.This research aimed to investigate the effect of light intensity and photoperiod on the growth performance and stress response of Nile tilapia(Oreochromis niloticus),which is an important commercial species,in a recirculating aquaculture system(RAS).Fingerlings with an average weight of 5±0.9 g were randomly assigned to nine 1.5 m3 tanks with 145 fish in each tank,cultured under different light intensities(1000,2000,and 3000 lx)and photoperiods(12L:12D,18L:6D,24L:0D),and fed to apparent satiation twice a day for 160 days.The growth of tilapia subjected to 2000 lx was significantly better than that exposed to 1000 and 3000 lx(P<0.05)as indicated by the final weight(351.17±10.59 g),growth efficiency(0.77±0.26),specific growth rate(2.65%±0.21%per day)and feed conversion coefficient ratio(1.30±0.36).No significant difference was observed in the growth rate among different photoperiod groups(P>0.05).Light intensity and photoperiod manipulation did not cause a significant chronic stress response in tilapia.This study demonstrated that light intensity,especially at 2000 lx,and photoperiod manipulation could stimulate the growth of tilapia in the RAS and significantly affect economic profitability.This study also served as an important reference for tilapia indoor aquaculture.

不同光质与光周期对粗肋草生长、叶片色素和颜色的影响

为改良粗肋草叶色和优化粗肋草设施栽培体系,该研究以粗肋草品种‘吉利红’的水培苗为材料,设置6种光质(白光、R∶B=1∶1、R∶B=1∶2、R∶B=2∶1、R∶B=1∶3、R∶B=3∶1,其中R、B分别代表红光、蓝光)和2种光周期(8、12 h·d^(-1))交叉培养,测定粗肋草的生长量、生物量、土壤和作物分析仪器开发(SPAD)值、花色素苷含量和叶片颜色参数(色相值a~*、色相值b~*、明度值L~*、色调角h~*),研究粗肋草对红蓝光质和光周期互作的响应。结果表明:(1)12 h·d^(-1)光周期更有利于粗肋草生物量的积累,其中LP11(R∶B=1∶3×12 h·d^(-1))处理的粗肋草苗木干重、鲜重均为最高,最有利于植物生长及生物量积累;其次是LP5(R∶B=1∶3×8 h·d^(-1))处理。(2)相同光质条件下,8 h·d^(-1)光周期处理的粗肋草叶片SPAD值比12 h·d^(-1)光周期处理高,12 h·d^(-1)光周期处理的粗肋草叶片花色素苷含量高于8 h·d^(-1)光周期的处理,LP11处理叶片SPAD值最低,花色素苷含量最高。12 h·d^(-1)光周期培养的粗肋草叶片颜色参数a~*、b~*值比8 h·d^(-1)光周期高,h~*值比8 h·d^(-1)光周期低。(3)主成分分析结果表明,LP11处理在促进粗肋草生长及叶色改良方面效果最好。综上认为,12 h·d^(-1)光周期更有利于粗肋草的生长和叶片颜色变化,其中LP11处理为最佳光质和光周期组合。