Physiological characteristics of a functional stay-green rice "SNU-SG1" during grain-filling period.
Physiological characteristics of a functional stay-green rice "SNU-SG1" during grain-filling period.
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DOI：
10.1007/s12892-009-0078-8
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发表时间：
2009-01-01
影响因子：
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通讯作者：
Lee, B. W.
中科院分区：
文献类型：
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作者：
Fu JinDong, Fu JinDong;Yan YongFeng, Yan YongFeng;Lee, B. W.
功能性保绿被认为是一个很有前途的特性，以提高水稻产量潜力。比较了从粳稻品种中筛选出的保绿功能稻“SNU-SG 1”和常规高产品种（HYVs）灌浆期叶片叶绿素、可溶性蛋白、根系活力的动态变化以及氮素积累和运转。SNU-SG 1在灌浆期上部4片叶片叶绿素和可溶性蛋白含量下降速度慢于HYVs“Suweon 490”和“Andabyeo”，表现出典型的持绿特性。尽管SNU-SG 1将抽穗前积累的N转移到籽粒中的比例与HYVs几乎相同，但由于灌浆期较高的根系活力维持了显著较高的N积累，因此它保持了较高的叶片N浓度。SNU-SG 1的保绿功能不仅来自于防止叶绿素降解的遗传控制，而且还来自于灌浆期持续强劲的根系活力所导致的较高的从土壤中吸收N的能力。SNU-SG 1在灌浆后期表现出比HYVs更高的作物生长速率，从而导致灌浆后期较高的籽粒灌浆率和茎中非结构性碳水化合物的再积累。SNU-SG 1具有“功能性保绿”特性，可通过改善籽粒灌浆提高水稻产量潜力。
Functional stay-green has been regarded as a promising characteristic to be introduced for improving rice yield potential. A functional stay-green rice "SNU-SG1" that was identified from japonica rice collections was compared with two regular high-yielding rice cultivars (HYVs) for the temporal change of leaf chlorophyll, soluble protein, and root activity, and nitrogen accumulation and remobilization during the grain-filling period. SNU-SG1 had slower decreasing rate and maintained higher concentration of chlorophyll and soluble protein in upper four leaves during the grain-filling period than HYVs "Suweon490" and "Andabyeo", revealing a typical stay-green characteristic. Even though SNU-SG1 remobilized almost the same proportion of N accumulated before heading as HYVs to grain, it maintained much higher leaf N concentration due to the significantly higher N accumulation that is ascribable to the higher root activity sustenance during grain-filling period. The functional stay-green trait of SNU-SG1 seems to stem not only from the genetic control preventing chlorophyll degradation but also from the higher capacity to absorb N from soil due to the sustained strong root activity during grain-filling period. SNU-SG1 exhibited higher crop growth rate during late grain-filling period than HYVs, resulting in higher grain-filling percentage and non-structural carbohydrate re-accumulation in the stem at the final stage of grain filling. It is concluded that SNU-SG1 has a promising trait "functional stay-green" contributable to rice yield potential improvement through the improved grain filling.