光强和红蓝光配比对瓠瓜幼苗生长及生理生化特性的影响

Effects of Light Intensity and the Ratio of Red to Blue Light on Growth and Some Physiological and Biochemical Indices of Lagenaria siceraria (Molina) Standl.

以瓠瓜品种‘福州芋瓠’为试材,在南方塑料大棚内密闭式光照植物培养架中,以荧光灯作为共同对照(CK),采用发光二极管(LED)调制光谱能量分布,设置50、100、120μmol·m^(-2)·s^(-1) 3个水平(表示为L50、L100、L120),红、蓝配比设置3∶7和7∶3等2个水平(表示为RB3∶7、RB7∶3),包括对照组共7个处理组合,各处理每天照光12h(8:00~20:00),研究不同光强和红蓝光配比对瓠瓜幼苗生长及其生理生化特性的影响。结果表明:(1)在处理7~14d时,瓠瓜幼苗叶片的叶绿素a、叶绿素b、叶绿素总量及其类胡萝卜素含量均随着处理天数的增加而增加,但处理后期,各色素指标有所下降。(2)光强一致时,红光比重大的处理组瓠瓜幼苗叶片可溶性糖含量较蓝光比重大的处理组增大更为显著;蓝光比重大的处理组的瓠瓜幼苗叶片可溶性蛋白质含量较红光比重大的处理组增大更为显著。(3)在光质红蓝配比分别RB3∶7、RB7∶3条件下,生长指标(株高、茎粗、叶面积、下胚轴长、壮苗指数和生物量)及若干生理生化特性(光合色素、可溶性糖、可溶性蛋白质和丙二醛含量)均随着光强的增大而显著提高,而MDA含量则显著降低。研究表明,瓠瓜幼苗在光强为120μmol·m^(-2)·s^(-1)下生长较好,且红蓝光配比为7∶3时更有利于瓠瓜幼苗的生长。

Growth,physiological,and biochemical attributes of Fuzhou Yuhu were studied under red and blue LED light with different intensities and ratio with fluorescent lamp（CK）as a control in a closed lighting growth chamber within a plastic greenhouse in south China.Two different light qualities i.e.,R∶B=7∶3and R∶B=3∶7with three different light intensities 50,100,120μmol·m^-2·s^-1 were used in this study.The results showed that：（1）after 7-14dtreatment,chlorophylls a,b and total chlorophyll and carotenoid content increased with the increasing number of days.However,the index of each pigment declined in the later stage.（2）Under the same light intensity,the soluble sugar content at higher red lightproportion was obviously higher than that at higher blue light proportion.However,the protein content in the seeding leaf at higher blue light was significantly higher than that in seeding leaf at higher red light.（3）With the increase of light intensity,gourd height,leaf area and other growth indicators had improved significantly,while the content of MDA decreased significantly.Hence,red and blue light 7：3with 120μmol·m^-2·s^-1 could better promote the growth,biomass and internal physiological indicators of gourd.