• 中文核心期刊
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  • 中国科技核心期刊
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不同光质对辣椒幼苗生长发育、光合作用及碳代谢的影响

Effects of Artificial Lighting on Growth, Photosynthesis, and Carbon Metabolism of Chili Pepper Seedlings

    摘要
  • 摘要:
    目的 为探究不同光质对辣椒幼苗生长发育、光合作用及碳代谢的影响。
    方法 以“世纪长龙2号”辣椒为试验材料，设置3种红光（R）和蓝光（B）的组合光，红光∶蓝光=2∶1（T1处理）、红光∶蓝光=3∶2（T2处理）、红光∶蓝光=3∶1（T3处理），以白光为对照(CK)，研究不同光质对辣椒幼苗生长、光合作用、糖含量及碳代谢关键酶活性的影响。
    结果 结果表明：不同光质处理下辣椒幼苗株高均高于对照，20～40 d时，T3处理显著高于CK，分别较CK提高26.22%、27.29%和8.49%，30 d时，T2和T3处理显著高于CK，较CK分别增加了10.50%和3.28%。20～40 d时，T1、T2和T3处理叶长均显著高于CK，T3处理叶宽、叶面积和叶片数显著高于CK。3个组合光质下，叶绿素含量均高于对照，其中，T3处理叶绿素a、叶绿素b和叶绿素a+b含量较CK分别增加14.52%、60.00%和52.17%。T2处理的净光合速率、胞间二氧化碳浓度和气孔导度均显著高于CK，较CK分别提高44.65%、43.45%和60.00%。T2处理葡萄糖、蔗糖和淀粉含量与CK相比均最高，分别较CK增加了50.14%、49.2%和34.17%；T3处理中性转化酶显著高于CK，较CK提高21.72%，T1处理蔗糖合成酶显著高于CK处理，较CK增加32.29%。
    结论 因此，红光∶蓝光=3∶2处理（T2）下辣椒幼苗生长健壮，光合速率大，糖含量高，利于碳水化合物的转化和积累，可作为培育壮苗的有效参数。

     

    Abstract:
    Objective Effects of artificial light exposure on growth, photosynthesis, and carbon metabolism of chili pepper seedlings were studied.
    Method Shijilonglong 2 chili pepper plants were grown under the artificial lighting using red (R) and blue (B) lamps in combinations of 2∶1 (T1), 3∶2 (T2) or 3∶1 (T3), along with white light as control (CK). Growth, photosynthesis, sugar content, and activities of key carbon metabolism-related enzymes of the seedlings were monitored.
    Result Comparing to CK, the lighting of various R+B lamp combinations grew taller seedlings in 20-40 d. The plants were 26.22% taller under T1, 27.29% under T2, and 8.49% under T3. On the 30th day, those under T2 were 10.50% and those under T3, 3.28% taller. The seedling leaves were significantly longer in 20-40 d under the combination lighting, and significantly wider, larger, and more numerous under T3. The chlorophyll a, chlorophyll b, and total chlorophyll of the seedlings increased by 14.52%, 60.00%, and 52.17%, respectively, under T3, while the net photosynthetic rate, intercellular CO2 concentration, and stomatal conductance became significantly 44.65%, 43.45%, and 60.00%, respectively, higher under T2. The contents of glucose, sucrose, and starch peaked with 50.14%, 49.20%, and 34.17%, respectively, increases under T2. Meanwhile, the neutral invertase activity rose significantly 21.72% under T3, and the sucrose synthase activity 32.29% under T1.
    Conclusion Chili pepper seedlings grew robustly when exposed to the combined R and B lamps in 3:2 ratio (T2) that boosted photosynthetic rate and sugar content to significantly enhance the carbohydrate transformation and accumulation in the plants.

     

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