摘要
In this study, 9 main traits of 774 spring wheat landraces in Tibet were investigated and analyzed. The results show that spring wheat landraces in Tibet have high plant height （with an average of 126.1 cm） and long growth period （with an average of 135.2 d）, with an average spike length of 9.5 cm, average effective tiller number per plant of 5.9, average spikelet number per spike of 19.9, average kernel number per spikelet of 3.5, average spikelet number per spike of 51.8, aver- age kernel weight per spike of 2.0 g, and average 1 000-grain weight of 38.1 g. Specifically, kernel number per spikelet of 2 landraces is larger than 6.0, spikelet number per spike of 2 landraces is larger than 100, kernel weight per spike of 2 landraces is larger than 4.0 g, 1 000-grain weight of 11 tandraces is larger than 50 g. There is abundant genetic diversity in those traits except in growth period, and the coefficient variation of 9 traits is in a decreasing order of effective tiller number per plant 〉 kernel weight per spike 〉 kernel number per spike 〉 spike length 〉 kernel number per spikelet 〉 1 000-grain weight 〉 plant height 〉 spikelet number per spike 〉 growth period. There is different relevance among different traits. Growth period is extremely significantly positively related to yield traits; grain number traits are extremely significantly positively relative to plant height and spike length, but ex- tremely significantly negatively relative to effective tiller number per plant; kernel number per spike is extremely significantly positively relative to kernel weight per spike, but extremely significantly negatively related to 1 000-grain weight; 1 000-grain weight is extremely significantly positively related to kernel weight per spike. Based on principal component analysis, these 9 traits could be included by 5 principal com- ponents （grain number, grain weight, spike length, tiller number and growth period）. According to the comprehensive evaluation values of these five principal components,
In this study, 9 main traits of 774 spring wheat landraces in Tibet were investigated and analyzed. The results show that spring wheat landraces in Tibet have high plant height (with an average of 126.1 cm) and long growth period (with an average of 135.2 d), with an average spike length of 9.5 cm, average effective tiller number per plant of 5.9, average spikelet number per spike of 19.9, average kernel number per spikelet of 3.5, average spikelet number per spike of 51.8, average kernel weight per spike of 2.0 g, and average 1 000-grain weight of 38.1 g. Specifically, kernel number per spikelet of 2 landraces is larger than 6.0, spikelet number per spike of 2 landraces is larger than 100, kernel weight per spike of 2 landraces is larger than 4.0 g, 1 000-grain weight of 11 landraces is larger than 50 g. There is abundant genetic diversity in those traits except in growth period, and the coefficient variation of 9 traits is in a decreasing order of effective tiller number per plant > kernel weight per spike > kernel number per spike > spike length > kernel number per spikelet > 1 000-grain weight > plant height > spikelet number per spike > growth period. There is different relevance among different traits. Growth period is extremely significantly positively related to yield traits; grain number traits are extremely significantly positively relative to plant height and spike length, but extremely significantly negatively relative to effective tiller number per plant; kernel number per spike is extremely significantly positively relative to kernel weight per spike, but extremely significantly negatively related to 1 000-grain weight; 1 000-grain weight is extremely significantly positively related to kernel weight per spike. Based on principal component analysis, these 9 traits could be included by 5 principal components (grain number, grain weight, spike length, tiller number and growth period). According to the comprehensive evaluation values of these five principal components, 50 landraces including ZM019573,
基金
Supported by Special Foundation for Biological Germplasm Resources Innovation&Functional Gene Discovery and Utilization of Xinjiang Production and Construction Corps(2012BB047)
"12th Five-Year"Breeding Project of Xinjiang Production and Construction Corps(2011BA002)
Fund from Key Laboratory for Cereal Quality Research and Genetic Improvement of Xinjiang Production and Construction Corps(CQG2012-XJ01)
