Grain filling pattern and cytokinin content in the grains and roots of rice plants
Grain filling pattern and cytokinin content in the grains and roots of rice plants
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DOI：
10.1023/a:1006356125418
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发表时间：
2000-03-01
影响因子：
4.2
通讯作者：
Gu, SL
中科院分区：
文献类型：
--
作者：
Yang, JC;Peng, SB;Gu, SL
研究了6个水稻品种（Oryza sativa L.）在田间和水培中生长的基因型。根据上级和下级小穗的灌浆速率，观察到3种灌浆模式，快速同步：所有小穗灌浆开始早，灌浆初期快，慢同步：所有小穗灌浆开始慢，达到最大灌浆速率晚，不同步：上级小穗灌浆开始早，达到最大灌浆速率早于下级小穗。3种灌浆方式的灌浆速率大小顺序为：快同步>异步>慢同步。上级和弱势粒Z + ZR含量的变化与籽粒灌浆方式有关。灌浆前期和中期籽粒和根系Z + ZR含量与灌浆速率呈极显著正相关。籽粒和根系中IAA和GA（GA（1）+ GA（3）+ GA（4））含量与灌浆速率相关不显著。结果表明，籽粒和根系中的细胞分裂素在籽粒发育的早期对籽粒灌浆起着重要的调节作用，从而影响籽粒的灌浆速率。
Grain filling patterns and their relationships with zeatin (Z), zeatin riboside (ZR), indole-3-acetic acid (IAA) and gibberellin (GA) contents in the grains and roots during grain development were examined in six rice (Oryza sativa L.) genotypes grown in the field and in water culture. Three grain filling patterns based on the filling rate of superior and inferior spikelets were observed, i.e., fast synchronous: all spikelets started filling early and fast at the early filling stage; slow synchronous: all spikelets filled slowly at the early filling stage and reached the maximum filling rate late; and asynchronous: superior spikelets started filling and reached the maximum filling rate much earlier than the inferior ones. The order of grain filling percentage in the three types of grain filling patterns was: fast synchronous > asynchronous > slow synchronous. Changes in Z + ZR contents in the superior and inferior spikelets were associated with the grain filling patterns. Grain filling percentage was significantly correlated with Z + ZR contents in the grains and roots at the early and middle grain filling stages. IAA and GA (GA(1) + GA(3) + GA(4)) contents in the grains and roots were not significantly correlated with grain filling percentage. The results suggest that cytokinins in the grains and roots during the early phase of grain development play an important role in regulating grain filling pattern and consequently influence grain filling percentage.