GENETIC ANALYSIS OF KEY FACTORS TO IMPROVE SEED YIELD OF SMOOTH BROMEGRASS (BROMUS INERMIS LEYSS.)

文献类型： 外文期刊

第一作者： Zhou, Yanchun

作者： Zhou, Yanchun;Mu, Chunsheng;Zhou, Yanchun;Gao, Shan;Lin, Jixiang

作者机构：

关键词： Smooth bromegrass; yield; seed production; germplasm resources; genetic analysis

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.553； 五年影响因子：0.521 ）

ISSN： 1018-4619

年卷期： 2020 年 29 卷 9A 期

页码：

收录情况： SCI

摘要： Smooth bromegrass (Bromus inermis Leyss.) is an important fodder grass in China, The yield of this species is affected by many factors. However, about the genetic analysis of key factors to improve seed yield of this grass are still poorly understood. In this study, 40 domestic and foreign germplasm resources of Bromus inermis were used as experimental materials to analyze the path analysis and genetic parameters on 18 key characters of seed yield, such as spike length, spikelet number, spindle branch number, 1000-seed weight, the variation degree of different characters and their contribution to seed yield were explored, The results showed that the variation coefficient of spike internode length among different germplasm resources was the largest, which was 44.18%, and the variation coefficient of 1000-seed weight was the smallest, which was only 9.77%. Regression analysis and path analysis showed that the spindle branch number, the spikelet number and the stem length were the main factors affecting seed yields. The first two were significantly positively correlated with seed yield, and the latter one was negatively correlated with seed yield. The regression model of seed yield was Z=14.7336X8+5.596X53.917X16. The results of heritability estimation showed that the broad heritability and relative genetic progress of seed yield, spindle branch number and spikelet number were 86.94% and 52.14%, 66.07% and 37.08%, 53.86% and 37.98%, respectively. Therefore, in the seed production of Bromus inermis. the key technical of increasing the yield of this species is to reduce the stein length and meanwhile increase the spindle branch number and spike let number. The results can provide theoretical basis for germplasm resources exploitation, utilization, and breeding improvement of smooth bromegrass.

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