不同LED光质对秋葵幼苗生长、生理特性和气孔特征的影响

Effects of different light qualities on growth,physiological and stomatal characteristic of okra( Abelmoschus esculentus L. ) seedlings

秋葵是一种重要的药食兼用作物,为筛选适合秋葵工厂化育苗的人工光源,以秋葵品种卡里巴为试材,采用单因素随机区组设计的盆栽试验,将穴盘育苗后长至子叶展平时的秋葵幼苗转入荧光灯(FL,对照)、蓝光(B)、蓝红组合1∶2BR_(1∶2)、红光(R)和黄光(Y)下进行照射,考察不同光质对秋葵幼苗生长指标、根系活力、光合色素含量、光合产物和气孔特征等的影响。结果表明,(1)秋葵幼苗的鲜样质量、干样质量、根长和茎粗以BR_(1∶2)处理最大,株高和叶面积以R处理最大;(2)BR_(1∶2)处理幼苗根系活力最高,其次为B处理;(3)幼苗叶片叶绿素a、叶绿素b和叶绿素总量在各光质处理下变化趋势基本一致,即BR_(1∶2)处理最大,其次是B处理,R处理下最小;(4)BR_(1∶2)处理幼苗叶片的可溶性糖和蔗糖的含量最高,R处理幼苗叶片的淀粉含量最高;(5)秋葵叶片上、下表皮的气孔面积均以BR_(1∶2)处理最大,其次为B处理,Y处理最小;叶片上、下表皮的气孔频度在BR1∶2处理下最大,其次为R处理,FL处理较小。可见,BR_(1∶2)能显著提高秋葵幼苗根系活力、叶片光合色素、光合产物的含量和气孔发育,有效促使幼苗快速、健壮生长,可采用BR1∶2作为秋葵育苗的人工光源。

Okra was an important medicinal and edible plants. The present study evaluated the effects of different light qualities on the growth, root activity, pigment content, photosynthetic production and stomatal characteristic of okra （ Abelmoschus esculentus L. ） seedlings with pot experiment in order to select a suitable light for okra artificial breeding. Cultivar Kaliba with two expanded cotyledons were exposed to five lights including fluorescent lamps （ FL, control） , blue （ B） light emitting diode （ LED） , blue plus red LED （ BR1：2 ） , red LED （ R） and yellow LED （ Y） . The present results showed that, （1） Fresh weight, dry weight, root length and plant height were greatest in okra seedlings under BR1：2 LED, stem width and leaf area were greatest in okra seedlings under R LED;（2） Root activity was greatest in okra seedlings under BR1：2 treatment, followed by B treatment;（3） The concentrations trend of chlo-rophyll a, chlorophyll b and total chlorophyll under five treatment were the same, the values were greatest in seed-lings under BR1：2 light, followed by B treatment, and smallest in seedlings under R light;（4） The concentration of soluble sugar and sucrose were greatest in seedlings under BR1：2 treatment, and the concentration of starch was grea-test in seedlings under R treatment;（5） Stomatal areas on the adaxial and abaxial surfaces of leaves were greatest in seedlings grown under BR1：2 LED, followed by those grown under B LED, and smallest in seedlings grown under Y light;Stomatal frequencies on the adaxial and abaxial surfaces of leaves were greatest in seedlings grown under BR1：2 light, followed by those grown under R, and smallest in seedlings grown under FL. So the growth and physiological index of okra seedlings were promoted under BR1：2 light. BR1：2 was the suitable light for okra seedling growth and could be used as a priority light for okra culture system.