不同光质对黄秋葵幼苗生长、光合色素和气孔特征的影响

以黄秋葵品种‘五福’为试材,采用单因素随机区组设计,探讨不同光质对黄秋葵幼苗生长、光合色素和气孔特征的影响。试验结果表明:与荧光灯(CK)处理相比,蓝光(B)、紫光(P)、红光(R)和蓝红复合光(BR)处理下的黄秋葵幼苗的鲜质量、干质量及其叶片的光合色素含量等指标均有不同程度的增加,且以BR处理为最高;在黄秋葵幼苗叶片气孔特征方面,其上表皮的气孔密度以BR和R处理下最大,而下表皮的气孔密度仅BR处理下最大;上、下表皮的气孔长轴长度,以BR处理下最大,B处理次之;上表皮的气孔短轴长度及气孔弧长均在BR处理下最大,而下表皮的气孔短轴长度、气孔弧长以B处理下最大,BR处理次之。可见,BR处理能显著促进黄秋葵幼苗的生长,幼苗生长快速健壮,并提高了叶片光合色素的含量,气孔发育相对较好,因此可采用BR作为黄秋葵育苗的人工光源。

Effects of different light qualities on the growth,photosynthetic pigments and stomatal characteristics of okra (Abelmoschus esculentus)seedlings

In order to identify suitable lighting for the artificial breeding of okra (Abelmoschus esculentus ),this study used pot experiments to evaluate the effects of different light qualities on the growth,pigment content and stomatal characteristics of okra seedlings.The ‘Wufu’cultivar was used as test material and,using a sin-gle factor randomized block design,the seedlings were exposed to five types of lighting:fluorescent (CK,con-trol),blue (B),purple (P),red (R)and blue plus red (BR).The results showed that compared to CK the seedlings’fresh mass,dry mass and photosynthetic pigment contents increased by varying degrees under the four treatments,with the largest increases recorded for BR lighting.Stomatal frequency on the adaxial surface of leaves was greatest in seedlings grown under BR and R.Stomatal frequency on abaxial surfaces was greatest under BR.Stomatal length on the adaxial and abaxial surfaces of leaves was greatest under BR,followed by B. Stomatal width and stomatal arc length on adaxial surfaces were greatest under BR,while on abaxial surfaces they were highest under B,followed by BR.Okra seedlings grew well under BR lighting,which promoted growth,photosynthetic pigments and stomatal characteristics.BR is suitable for okra seedlings and can be used as a priority light in okra culture systems.