Effects of supplemental light duration on greenhouse sweet pepper plants and fruit yields
Effects of supplemental light duration on greenhouse sweet pepper plants and fruit yields
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DOI：
10.21273/jashs.123.2.202
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发表时间：
1998-03-01
影响因子：
1.9
通讯作者：
Wien, HC
中科院分区：
文献类型：
--
作者：
Demers, DA;Gosselin, A;Wien, HC
甜椒 (Capsicum annuum L.) 植物在自然光照或补充光照下生长，将光周期延长至 16、20 或 24 小时。将光周期增加到 16 和 20 小时会增加辣椒植物的产量，但与 20 小时光周期相比，持续光照（24 小时）会降低产量。在第二个实验中，植物暴露在 14 或 24 小时的光周期下，并且每四个节点修剪一个果实或不修剪。在处理的第一周内，在连续光照下生长的植物具有更高的芽质量（新鲜和干燥）和产量。经过 7 至 8 周的处理后，连续光照下的植物比暴露于 14 小时光周期的植物生长得更慢。实验结束时，14小时光周期下生长的植物的芽质量和产量等于或高于连续光照下的植物。因此，提供连续几周的光照以提高生长和产量似乎是可能的。限制每株植物的果实数量会增加枝条质量并降低产量，但对辣椒植物对光周期处理的总体反应没有影响。叶子矿物质成分不受光周期处理的影响，表明连续光照下生长和产量的下降并不是由于矿物质营养不平衡造成的。持续光照下叶片淀粉和糖含量增加。然而，水果修剪处理并没有改变不同光周期处理下淀粉和糖积累的模式，24小时光周期下测量的生长和产量减少可能是由于叶子限制而不是库限制导致的叶子中淀粉和糖积累的解释。
Sweet pepper (Capsicum annuum L.) plants were grown under natural or supplemental lighting that extended the photoperiods to 16, 20, or 24 hours. Increasing the photoperiod to 16 and 20 hours increased pepper plant yields, but continuous light (24 hours) decreased yields compared to the 20-hour photoperiod. In a second experiment, plants were exposed to a photoperiod of 14 or 24 hours and either pruned to one fruit every four nodes or not pruned. During the first weeks of treatments, plants grown under continuous light had higher shoot mass (fresh and dry) and yields. After 7 to 8 weeks of treatments, plants under continuous light grew more slowly than plants exposed to a 14-hour photoperiod. At the end of the experiment, shoot mass and yields of plants grown under a 14-hour photoperiod were equal to or higher than plants under continuous light. So, it seems possible to provide continuous lighting for a few weeks to improve growth and yields. Limiting the number of fruit per plant increased shoot mass and decreased yields, but had no effect on the general response of pepper plants to photoperiod treatment. Leaf mineral composition was not affected by photoperiod treatment, indicating that reduced growth and yields under continuous light were not due to unbalanced mineral nutrition. Leaf starch and sugar contents were increased under continuous light. However, fruit pruning treatments did not modify the pattern of starch and sugar accumulation under the different photoperiod treatments, Reduced growth and yields measured under a 24-hour photoperiod are probably explained by starch and sugar accumulation in leaves as a result of leaf limitations rather than a sink limitation.