Phyllochron Dynamics Under Controlled Environments in Rice (Oryza Sativa L.) |
| |
| Authors: | Youki Itoh Yoshio Sano |
| |
| Institution: | (1) Rice Breeding Laboratory, Department of Crop Breeding, National Agricultural Research Center for Hokkaido Region, National Agriculture and Bio-oriented Research Organization, Sapporo 062-8555, Japan;(2) Plant Breeding Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan |
| |
| Abstract: | Previously, we reported that phyllochron of rice greatly fluctuated in the course of development under natural conditions. The present study was carried out to examine the phyllochron dynamics using the five near-isogenic lines (NILs) for heading time and the recurrent parent. The change of phyllochron was investigated under four different controlled conditions regarding daylength and temperature. Growth duration (days to heading) showed a large variation among different growth regimes as well as genotypes. Changes of phyllochron were evaluated in the genotypes by using a quartic polynomial regression that was well fitted to the change of phyllochron in the present controlled environments as previously observed under natural conditions. Phyllochron began to drastically increase after around the 5th phytomer order and decreased with the progress of reproductive development in similar manners under different environments. The pattern of phyllochron change varied from a flat to non-flat shape. The shape of the equation was affected by genotypes as well as daylengths and temperatures. In addition, the shape was closely related to the growth duration (days to heading) of the genotype, suggesting that the phyllochron might internally increase depending on the genotype controlling the heading date. Therefore, the present results showed that the sufficient examination of phyllochron dynamics is necessary for understanding a variation in the heading date of rice. |
| |
| Keywords: | phyllochron growth duration heading date genotype-by-environment interaction NILs rice |
| 本文献已被 SpringerLink 等数据库收录！ |
|
