Application of ratoon to a test of agronomic characters in rice breeding. I. Variation in ratoon ability and its relation to agronomic characters of mother plant

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Title
Application of ratoon to a test of agronomic characters in rice breeding. I. Variation in ratoon ability and its relation to agronomic characters of mother plant
Title Alternative
水稲における再生の育種的利用に関する研究:I.品種間差異ならびに農業諸形質との関係
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Description

30 cultivars of paddy were growh in a randomized block design with 4 replications. The rice plants were cut at 5cm above the ground at 4 different growth stages, i, e. 10, 20, 30 and 40 days after headingf. Ratoon weight, ratoon height and percentage of ratoon tillers to that of mother plant, were recorded 40 days after cutting. With respect to the 3 ratoon characteristics a significant decrease was observed to occur when the cutting time was delayed from 10 to 20 days after heading. The increase in the subsequent cutting was less marked. Analysis of variance suggests that ratoon weight, ratoon height and percentage of ratton tillers are heritable. In cuttings made 10 and 20 days after heading, there was a positive and highly significant phenotypic correlation between percentage of ripened grains of mother plant and these ratoon traits. Heritabilities in the broad sense for the ratoon traits became higher in the order, ratoon weight, ratoon height, percen-tage of ratoon tillers. Moreover, the heritability of percentage of ratoon tillers was nearly equal to that of culm length and panicle length. These facts show that ripening ability of rice plant may be tested by observing the ratoon, especially percentage of ratoon tillers.

水稲における再生の育種的利用を検討するため,水稲30品種を供試し,出穂後10,20,30および40日に地際より5cmで地上部を剪除し,剪除後40日に再生重,再生草丈および再生茎率を調査した。再生重,再生草丈および再生茎率のいずれもは、剪除時期が出穂後10日から20日へ移動するに伴い,顕著に減少したが,その後はおおむね増大するようであった。分散分析の結果,再生重,再生草丈および再生茎率が品種固有の遺伝的特性であることを示唆した。また出穂後10および20日に剪除したときの再生重,再生草丈および再生茎率は豊熟歩合と有意な正の表現型相関を示した。遺伝力(広義)も再生重,再生草丈,再生茎率の順に高くなり,とくに再生茎率の遺伝力は稈長,穂長または1穂頴化数のそれに匹敵するほどであった。以上の結果から,水稲の再生,たとえば出穂後10日に地上部を剪除したときにみられる再生茎率を調べることにより豊熟歩合を容易に検定できることが示唆された。

Author
著者 Ichii Masahiko
著者(ヨミ) イチイ マサヒコ
著者(別表記) 一井 真比古
著者 Kuwata Hikaru
著者(ヨミ) クワタ ヒカル
著者(別表記) 桑田 晃
Publication Title
育種学雑誌
Volume
31
Issue
3
Start Page
273
End Page
278
Publisher
日本育種学会
Published Date
19810901
ISSN
0536-3683
NCID
AN00013906
Resource Type
Journal Article
Language
eng
Relation URL(isReplacedBy)
http://ci.nii.ac.jp/naid/110001810814
Rights
日本育種学会
本文データは学協会の許諾に基づきCiNiiから複製したものである
Text Version
publisher
Set
香川大学
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