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Phyllochron Dynamics Under Controlled Environments in Rice (Oryza Sativa L.)

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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.

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Abbreviations

DH:

total number of days to heading

Ef1 :

Early-flowering-1

H:

high temperature

L:

low temperature

m-Ef1 :

modifier of early-flowering-1

NILs:

near-isogenic lines

Se1 :

Photosensitivity-1

10 h :

10-hour daylength

13 h :

13-hour daylength

T65:

Taichung 65

wx :

waxy

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Authors and Affiliations

  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

    Youki Itoh

  2. Plant Breeding Laboratory, Graduate School of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan

    Yoshio Sano

Authors
  1. Youki Itoh
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  2. Yoshio Sano
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Correspondence to Yoshio Sano.

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Itoh, Y., Sano, Y. Phyllochron Dynamics Under Controlled Environments in Rice (Oryza Sativa L.). Euphytica 150, 87–95 (2006). https://doi.org/10.1007/s10681-006-9096-5

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  • DOI: https://doi.org/10.1007/s10681-006-9096-5

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