Low red to far-red ratios reaching the stem reduce grain yield in sunflower
Low red to far-red ratios reaching the stem reduce grain yield in sunflower
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DOI：
10.2135/cropsci2002.1180
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发表时间：
2002-07-01
期刊：
影响因子：
2.3
通讯作者：
Casal, JJ
中科院分区：
文献类型：
--
作者：
Libenson, S;Rodriguez, V;Casal, JJ
通过增加冠层密度，到达农作物茎部的红光 (R) 与远红光 (FR) 的比率会降低。我们试图研究这种增加茎的资源分配的光信号是否会影响向日葵（Helianthus annuus L.）植物的产量。通过在该器官周围放置选择性塑料过滤器，以非常低的密度在户外盆中种植的向日葵植物的茎暴露于低R/FR比率。对照植物在茎周围有一个透明的过滤器，并接收未经过滤的阳光的 R/FR 比率。在开放授粉品种 Guayacin II、杂种“Dekalb G 100”和品系 MA 566 的实验中，低 R/FR 比率促进茎伸长生长和干物质积累，而不影响茎干物质与长度之间的比率。与日光 R/FR 比率对照相比，低 R/FR 比率降低了籽粒产量和单株籽粒数，但不影响籽粒干重。没有观察到 R/FR 比率与品种或播种日期的显着相互作用。茎生长和屏蔽之间的负相关性并没有延伸到观察到的植物身材和谷物产量的遗传变异性。我们认为，通过密集林地典型的低 R/FR 比率来促进茎生长可能会减少向日葵作物中可用于谷物产量的资源。
The red light (R) to far-red light (FR) ratio reaching the stem of crop plants is reduced by increasing canopy densities. We sought to investigate whether this light signal that increases resource allocation to the stem affects yield in sunflower (Helianthus annuus L.) plants. The stem of sunflower plants grown outdoors in pots at very low densities was exposed to low R/FR ratios by placing selective plastic filters around this organ. Control plants had a clear filter around the stem and received the R/FR ratio of unfiltered sunlight. In experiments with the open pollinated cultivar Guayacin II, the hybrid 'Dekalb G 100', and the line MA 566. low R/FR ratios promoted stem extension growth and dry, matter accumulation without affecting the ratio between stem dry matter and length. In comparison with the sunlight R/FR ratio controls, low R/FR ratios reduced grain yield and grain number per plant, without affecting grain dry weight. No significant interaction of the R/FR ratio with cultivar or sowing date was observed. The negative correlation between stem growth and shield did not extend to the genetic variability observed for plant stature and grain yield. We e propose that the promotion of stem growth by the low R/FR ratios typical of dense stands could reduce the resources available for grain yield in sunflower crops.