Salt Stress Effect on the Growth and Physiological Characteristics of Three New Varieties of Lagerstroemia indica

The effects of different concentrations of NaCI （0, 0.10%, 0.25%, 0.40%, 0.55%, 0.70%） on the growth and physiological characteristics of three new varieties of Lagerstroemia indica were studied by pot experiment in the plastic greenhouses. The results showed that under different NaCI concentrations, the relative height in- crement and the relative diameter increment of L. indica were restrained obviously; the contents of chlorophyll a, chlorophyll b, carotenoid and GSH decreased with in- crease of NaCI concentration; and the content of MDA increased with increase of NaCI concentration. Through the determination and comparison of physiological in- dexes, and analysis of correlativity, NaCI tolerance of the three new L. indica vari- eties ranked as L. indica ＇Pink Velour＇〉L. indica ＇Dynamite＇〉L. indica ＇Red Rock- et＇. This is consistent with the results of the morphological characteristics after Na- CI stress.

Response of Eight Market Classes of Dry Bean (<i>Phaseolus vulgaris</i>L.) to Pendimethalin

There is little information on the tolerance of dry bean to pendimethalin. Field studies were conducted in 2007 to 2009 at Exeter, Ontario and in 2008 and 2009 at Ridgetown, Ontario to evaluate tolerance of black, cranberry, kidney, otebo, pink, pinto, Small Red Mexican and white bean to the pendimethalin applied preplant incorporated at 1080 and 2160 g.a.i.ha-1. Pendimethalin PPI caused minimal injury in most market classes of dry bean at 1 and 2 WAE. There was no injury in various market classes of dry bean with the low dose at 1 and 2 weeks after emergence (WAE). However, at the high dose there was 0 to 4% injury at 1 WAE and 0 to 7% injury at 2 WAE in black, cranberry, kidney, otebo, pink, pinto, SRM and white bean. Pendimethalin PPI was more injurious in white bean than in black, cranberry, kidney, otebo, pink, pinto and SRM bean. Pink and SRM bean exhibited the most tolerance to pendimethalin applied PPI at 1080 g.ai.ha-1 or 2160 g.ai.ha-1. Pendimethalin caused no adverse effect on plant height, shoot dry weight, seed moisture content and seed yield of black, cranberry, kidney, otebo, pink, pinto, SRM and white bean. Based on these results, there is an adequate margin of crop safety for pendimethalin applied PPI at the proposed dose of 1080 g.ai.ha-1 in black, cranberry, kidney, otebo, pink, pinto, SRM and white bean in Ontario.

常夏石竹快速繁殖技术研究

以常夏石竹茎段为培养材料,探讨了适于常夏石竹快速繁殖的培养条件。结果表明:腋芽增殖培养基为MS+1.0 mg/L 6-BA+0.1 mg/L NAA;诱导愈伤组织的培养基为MS+1.0 mg/L 2,4-D+0.5 mg/L 6-BA;愈伤分化培养基为MS+0.2 mg/L 6-BA+4 mg/L KT+0.02mg/L IAA。

GBS高密度遗传连锁图谱定位甘蓝型油菜粉色花性状

甘蓝型油菜花瓣颜色是重要的观赏性状,花瓣颜色的选育和改良已成为材料创制的主要研究方向。目前对甘蓝型油菜粉色花性状定位研究未见报道。本研究以甘蓝型油菜纯系黄花62和甘蓝型油菜纯系粉花77为亲本构建双单倍体(doubled haploid,DH)群体。利用简化基因组测序技术(genotyping-by-sequencing,GBS)筛选出3253个单核苷酸多态性(single nucleotide polymorphism,SNP)标记,构建了全长1766.06 cM甘蓝型油菜连锁图谱,标记间平均遗传距离为0.54 cM;使用WinQTL Cartographer复合区间作图方法对粉色花性状进行数量性状座位(quantitative trait locus,QTL)定位,检测到位于A07和C03染色体上各1个QTL;将定位区间内基因与甘蓝和白菜同源基因进行线性比对,在这些区间中找到了一些存在于3个物种的同源基因;对粉色花定位区间内基因进行可变剪切分析发现,2个花色相关基因BnaA07g15980D和BnaA07g17500D在亲本粉色花瓣中发生内含子保留可变剪切。上述研究结果为甘蓝型油菜粉色花相关基因精细定位和分子连锁标记开发提供了更多线索。

欧石竹‘初吻’在拉萨的栽培技术及其在园林花境中的应用

‘初吻’为石竹科、石竹属种间杂交育种选育的优良品种,为多年生地被草本花卉,主要分布在地中海、欧洲中部和西部地区,具有适应性强、观赏期长、易繁殖、抗病虫性强等优点,是拉萨高海拔地区优质的缀花草坪花卉,可应用于园林绿化及花境造景。该文介绍了‘初吻’的特征特性、养护管理、繁殖技术及其在园林花境中的应用,以期为‘初吻’在拉萨扩大设施栽培规模及园林花境造景艺术提供参考。

石竹玻璃化苗的显微结构及气孔运动特性

为从细胞水平研究组培苗玻璃化发生规律及机制,用透射电子显微镜和扫描电子显微镜观察了石竹玻璃化苗解剖结构、细胞亚显微结构及气孔运动特性。结果表明,与正常苗相比,石竹玻璃化苗表皮蜡质层薄,细胞膨大变形,相邻细胞不能紧密嵌合;气孔器畸形,气孔密度降低,开度增大。薄壁组织细胞排列散乱,膨胀变形,部分细胞破裂,溶质外渗;细胞中细胞质稀薄,细胞器稀少,内膜系统遭到破坏;叶绿体中类囊体解体,淀粉粒数量减少,嗜锇颗粒体积增大、数量增多。输导组织发育不良,导管管壁变薄、松弛皱缩,导管腔出现塌陷、堵塞。气孔在脱落酸、黑暗及脱水处理下均不能正常关闭。说明玻璃化苗细胞过度吸水,气孔运动异常,细胞亚显微结构受到破坏,组织结构及功能受损,影响了气体的交换、水分的吸收及物质的合成和运输。