饲用小黑麦重组自交系群体草产量的相关性状分析

Analysis on correlation characters of grass yield in recombinant inbred lines of forage triticale

摘要:

【目的】探究饲用小黑麦草产量的主要影响因素。【方法】以石大 1 号小黑麦与甘农 7 号小黑麦构建的重组自交系（RIL）群体为材料，对 F₆代 273 个单株的 6 个草产量相关性状（株高、分蘖数、旗叶长、旗叶宽、穗下节间长和单株鲜重）进行表型鉴定和统计分析。【结果】6 个性状变异系数范围为 9. 68%~64. 10%，其中单株鲜重最大，其次是分蘖数、穗下节间长和株高，最后是旗叶长和旗叶宽；单株鲜重与分蘖数的相关系数最大（0. 764），与穗下节间长的相关系数最小（0. 052）。【结论】主成分分析将草产量相关性状综合为生物量构成因子和株高构成因子，累积贡献率为 70. 81%。本研究可为饲用小黑麦新品种选育提供参考。

Abstract:

【Objective】 In order to explore the main influencing factors of the yield of forage-type triticale. 【Method】 The recombinant inbred line （RIL） population constructed from 'Shida No. 1' triticale and 'Gannong No. 7' triticale was used as the research object and the phenotypic identification and statistical analysis of 6 grass yieldrelated traits （plant height，tiller number，flag leaf length，flag leaf width，internode length under panicle and fresh weight per plant） of 273 plants of F₆ generation were carried out.【Result】 The results showed that the coefficient of variation ranged from 9. 68% to 64. 10%. The coefficient of variation of the fresh weight per plant was the largest，followed by those of the number of tillers，the length of the internodes under the panicle， the height of the plant，and the length of the flag leaf. And the coefficient of variation of the width of the flag leaf was the smallest. The correlation coefficient between fresh weight per plant and the number of tillers was the largest （0. 764），the correlation coefficient with internode length below spike is the smallest （0. 052）.【Conclusion】 By principal component analysis， the grass yield-related traits were integrated into biomass components and plant height components，and the cumulative contribution rate reached 70. 81%. This study could provide a reference for the selection and breeding of new varieties of forage triticale.