Effects of sd1 and Ur1 (Undulate rachis -1) on Lodging Resistance and Related Traits in Rice

スポンサーリンク

概要

• 論文の詳細を見る

• The sd1 (dee-geo-woo-gen dwarf) gene has contributed to develop short-culm and high-yielding varieties widely grown in Southeast Asia and other areas. An incompletely dominant gene Ur1 (Undulate rachis -1) increases spikelet number per panicle, and can heighten grain yield in either the Ur1/Ur1 or Ur1/+ genotype by enlarging sink size. The effects of sd1 and Ur1 on lodging resistance and related traits were examined. The Ur1/Ur1, Ur1/+ and +/+ genotypes with sd1 (denoted by u, h and d, respectively, viz. three dwarfs) and those without sd1 (U, H and T, respectively, viz. three tails) under the common genetic background of a japonica variety Taichung 65 were grown in a field condition, sd1 reduced culm length by 29 to 37% and changed the internode elongation pattern toward the upper internode elongation type, whereas Ur1 increased culm length by 12 to 25% and changed toward the lower internode elongation type. The index of lodging was applied to the 4th internode, which was the 4th-panicle length (the total length from the 4th internode to panicle) × the 4th-top weight (the fresh weight including leaves at and above the 4th internode) / the breaking strength at the 4th internode. sd1 decreased the index of lodging by 47 to 59% with and without Ur1, being caused by the reduction of the 4th-panicle length and the increase of breaking strength, although its effect on reducing the 4th-top weight was not significant. The effect of sd1 on the breaking strength made a greater contribution towards the lodging-resistance enhancement than its height-reducing effect. Ur1, in the Ur1/Ur1 genotype, increased the index of lodging by 90 and 61 % with and without sd1, respectively; while Ur1, in the Ur1/+ genotype, increased it by 73 and 32% with and without sd1. The increase of the index (deterioration of lodging resistance) by Ur1 was due to the reduction of breaking strength and the increases of both the 4th-panicle length and 4th-top weight. It is suggested that genes with lodging-resistance-enhancing effect should be introduced together with sd1 when Ur1 is utilized to develop high-yielding varieties.

著者

• Murai Masayuki

  Faculty of Agriculture, Kochi University

• Murai Masayuki

  Faculty Of Agriculture Kochi University

• Murai Masayuki

  Fac. Of Agriculture Kochi Univ.

• Komazaki Tomoaki

  Faculty of Agriculture, Kochi University

• Sato Shigetoshi

  College of Agriculture, University of Ryukyus

• Murai M

  Faculty Of Agriculture Kochi University

• Komazaki Tomoaki

  Faculty Of Agriculture Kochi University

• Sato Shigetoshi

  College Of Agriculture University Of Ryukyus

関連論文

• Yield-increasing Effect of a Major Gene, Ur1 (Undulate rachis-1) on Different Genetic Backgrounds in Rice
• Effects of sd1 and Ur1 (Undulate rachis -1) on Lodging Resistance and Related Traits in Rice
• High Yielding F_1 Hybrid Carrying Ur1 (Undulate rachis -1) Gene in Japonica Rice
• Effects of a Major Gene Ur1 Characterized by Undulation of Rachis Branches on Yield and its Related Traits in Rice
• Effects of Different Types and Concentrations of Gelling Agents on the Physical and Chemical Properties of Media and the Growth of Banana (Musa spp.) in Vitro
• イネ品種台中65号の同質相互転座系統,RT2-3b・T65に由来する部分的1・3染色体植物の遺伝〔英文〕
• イネ早生遺伝子Ef-xの感温作用〔英文〕
• Effect of the Dwarfing Gene d18-k on Cool Tolerance at Booting Stage under the Genetic Background of an Extremely Cool-tolerant Rice Line Norin-PL11, and its Relation with Water Depth
• Effects of the Dwarfing Gene Originating from 'Dee-geo-woo-gen' on Yield and its Related Traits in Rice
• Effects of Dwarfing Genes on Chilling Tolerance at Seedling Stage in Rice

スポンサーリンク