Developmental changes of phyllochron in near-isogenic lines of rice (Oryza sativa L.) with different growth durations
Developmental changes of phyllochron in near-isogenic lines of rice (Oryza sativa L.) with different growth durations
复制标题
不同生育期水稻近等基因系叶序发育变化
DOI：
10.1023/a:1017577218630
复制
发表时间：
2001
期刊：
影响因子：
1.9
通讯作者：
Y. Sano
中科院分区：
文献类型：
--
作者：
Y. Itoh;Shigetoshi Sato;Y. Sano
由叶、节、节间和腋芽组成的植物体单元在植物构件组织的发育中起着重要作用。水稻的显著特点是植物体的产生速率与叶片的出叶速率密切同步。利用10个不同生育期的水稻近等基因系研究了叶时的发育变化。这些近等基因系是通过与一个对光周期几乎不敏感的品系回交建立的，它们由早花或晚花近等基因系组成，其生育期的差异是由6个位点的等位基因组合引起的。用四次多项式拟合了叶时的发育模式，在大多数情况下拟合良好。结果表明，早花近等基因系叶时变化不明显，但晚花近等基因系和轮回亲本叶时变化较大。因此，叶时的发育变化高度依赖于基因型和/或生育期，但它既不与成花和温度，表明叶时的变化可能反映了内部或生理变化发生在水稻的生活史。
The repeated elements called phytomers, which consist of leaf, node, internode and axillary bud, play an important role in the development of modular organization in plants. Rice has the striking feature that the rate of the phytomer production is closely synchronized with the rate of leaf emergence (phyllochron). We examined developmental changes of phyllochron by using 10 near-isogenic lines (NILs) showing diversified growth durations in rice. The NILs were established by backcrosses with a strain practically insensitive to photoperiod, and they consisted of early- or late-flowering NILs whose differences of growth duration were caused by the combinations of alleles at 6 loci. The developmental patterns of phyllochron were evaluated by means of a quartic polynomial, which fitted well in most cases. The results indicated that phyllochron greatly changed during development, especially in late-flowering NILs as well as the recurrent parents, although the fluctuation of phyllochron was not so marked in the early-flowering NILs. Thus, the developmental change of phyllochron was highly dependent upon the genotypes and/or growth duration; however, it was associated with neither floral initiation nor temperature, indicating that the change of phyllochron might reflect internal or physiological changes which occur during the life cycle of rice.