西藏林芝地区核桃表型特征研究

通过对西藏林芝地区核桃表型特征进行研究,以期为西藏核桃的选育提供参考。依照核桃的性状调查方法,研究了林芝地区4个居群8个核桃家系:朗县(LX1-4)、米林县(ML7-8)、林芝县(LZ5-6)和2个铁核桃家系:波密县(BM9-10)的叶型、不同居群核桃表型特征以及坚果特征。结果表明:顶叶长与宽之比LX2最大,ML7最小;复叶长与宽比例LZ5最大,BM10最小;复叶最长的为ML7,最短者为BM10。坚果质量:BM>LX>ML>LZ;仁坚比:LX>ML>LZ>BM;壳厚:BM>LZ>ML>LX。坚果纵横径比值最大的为BM9,最小的为LX1。林芝地区朗县核桃可作为优良家系进行繁殖,波密的铁核桃保持着较高的遗传多样性,是选种和育种的优先资源。

Phenotype characteristics of walnuts in Linzhi,Tibet

In order to provide a reference for breeding,the characteristics of Juglans regia L.in Linzhi,Tibet were investigated four populations and 10 families of Juglans regia L.and J.sigillata Dode were involved in the research,including Long County(LX1-4),Milin County(ML7-8),Linzhi County(LZ5-6),Bomi County(BM9-10) in Linzhi zone.Leaf type,phenotypes of different populations and nut features were analyzed.The results showed that the ratio of length and width of parietal lobe of LX2 was the maximum,but that of ML7 was the minimum.Compound leaf length and width ratio of LZ5 was the largest and that of BM10 was the minimum.The length of compound leaf of ML7was,the longest,but that of BM1 was the shortest.Nut weight was in order of BM> LX> ML> LZ.Ratio of kernel and nut was in order of LX> ML> LZ> BM and shell thickness was in order of BM> LZ> ML> LX.The ratio of longitudinal and transversal diameter of BM9 nut was the maximum,and that of,LX1 was the smallest.The results suggested that Long County walnut was a good pedigree for breeding,and J.sigillata Dode of Bomi County maintained high genetic diversity which was good for selection and breeding.