CARBON AND NITROGEN SUPPLY DURING SEED FILLING AND LEAF SENESCENCE IN SOYBEAN
CARBON AND NITROGEN SUPPLY DURING SEED FILLING AND LEAF SENESCENCE IN SOYBEAN
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DOI：
10.2135/cropsci1995.0011183x003500040024x
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发表时间：
1995-07-01
期刊：
影响因子：
2.3
通讯作者：
CRAFTSBRANDNER, SJ
中科院分区：
文献类型：
--
作者：
HAYATI, R;EGLI, DB;CRAFTSBRANDNER, SJ
种子灌浆过程中叶片衰老和氮素再分配可能限制大豆的甘氨酸含量。稳定。通过限制种子灌浆期来提高产量。通过田间和温室试验，研究了种子氮素需要量与叶片衰老的关系。植物(简历。从R1到R5（开始灌种），在遮荫布下生长（遮荫布减少了63%的日照），然后为了增加光合作用、种子干物质和氮积累，对一些植株去除遮荫。试验包括生长在无根瘤土壤中的植物（NO3-作为主要氮源），生长在有许多根瘤土壤中的植物（NO3-和N-2固定的氮），以及在水培系统中生长的植物（NO3-作为主要氮源），在R5时从培养基中去除氮。提高R5下的光合作用可增加种子干物质积累，且在速效氮条件下响应更大。氮素有效的情况下，种子氮素积累也增加。当植株不需要氮素时，增加光合作用对种子氮素积累没有影响。通过测定上部叶片叶绿素和氮的时间变化来表征叶片衰老。在任何处理中，增加光合作用都没有加速叶片衰老。如果氮素有效，则光合作用增加，氮素吸收量增加。氮素不足时，种子氮浓度降低。这些数据表明，叶片衰老不是由于种子对氮的需求而发生的，而可能受到叶片过程的调节。
Leaf senescence and N redistribution during seed filling may Limit soybean [Glycine mar (L.) Merr.] yield by restricting the seed filling period. Experiments were conducted in the field and greenhouse to evaluate the relationship between seed N demand and leaf senescence. plants (cv. McCall) were grown under shade cloth (which reduced insolation by 63%) from R1 to R5 (beginning seed fill), then the shade was removed from some plants with the objective of increasing photosynthesis, seed dry matter, and N accumulation. Experiments included plants grown In soil with no nodules (NO3- as primary N source), plants grown in soil with many nodules (N from NO3- and N-2 fixation), and in a hydroponics system (NO3- as primary N source) where N was removed from the media at R5. Increasing photosynthesis at R5 increased seed dry matter accumulation and the response was larger when N was available. Seed N accumulation also increased if N was available. Increasing photosynthesis had no effect on seed N accumulation when N was not available to the plant. Temporal changes in chlorophyll and N of an upper leaf were measured to characterize leaf senescence. Increasing photosynthesis did not accelerate leaf senescence in any of the treatments. If N was available, N uptake increased when photosynthesis increased. If N was not available, seed N concentration decreased. The data suggest that leaf senescence does not occur because of seed N demand, but may be regulated by processes in the leaf.