巴青垂穗披碱草种子产量与农艺性状相关性分析

Correlation analysis of seed yield with agronomic traits in Elymus nutans‘Baqing’

垂穗披碱草(Elymus nutans)既是优质牧草,也是生态修复的先锋植物。巴青垂穗披碱草是西藏第1个野生牧草驯化品种,为提高巴青垂穗披碱草种子产量,明确巴青垂穗披碱草种子产量与农艺性状的关系,本研究以3个种子产量指标与7个农艺性状指标为研究对象,采用主成分分析、典型相关分析以及逐步回归法分析了巴青垂穗披碱草种子产量与农艺性状的关系。结果表明:单株穗数和单株产量与分蘖数、平均旗叶长呈极显著正相关关系(P<0.01);综合农艺性状指标变量V1和V2,分蘖数和株高结构系数相对较大,可见分蘖数与株高是决定垂穗披碱草种子产量的主要因子。基于逐步回归法分析发现单株产量与单株穗数、平均穗粒数极显著相关(P<0.01);平均穗粒数与单株穗数、种子长度、平均拔节数、株高、平均旗叶长显著相关(P<0.05);单株穗数与种子长度、芒长、平均拔节数显著相关(P<0.05)。因此或可通过增加旗叶长来增加单株穗数与单株产量,进而提高巴青垂穗披碱草种子产量。

Elymus nutans is the first domesticated wild forage grass in Tibet.We selected three seed yield indices and seven agronomic traits in an effort to identify correlations between seed yield and agronomic traits of E.nutans‘Baqing’.We sought to identify correlations between seed yield and agronomic traits of E.nutans‘Baqing’by principal component analysis,typical correlation analysis,and a stepwise regression method.Correlation analysis revealed that the number of spikes per plant and yield per plant both correlated positively with plant height,number of tillers,and mean flag leaf length(P<0.01)with a high degree of significance.Typical correlation analysis revealed that the number of tillers and seed length structure coefficients increased with increases in the combined agronomic trait index variables V1 and V2,indicating that the number of tillers and plant height are the main factors determining seed yield from Plantago lanceolata pendants.Stepwise regression analysis gave highly significant(P<0.01)coefficients correlating single plant yield with number of single spikes and average number of grains per spike.The average number of grains per spike was significantly different from the partial correlations between number of single spikes,seed length,average number of nodules,plant height,and average flag leaf length(P<0.05).The partial correlation of the number of single spikes with seed length,awn length,and average number of nodules per spike was found to be significantly different(P<0.05).Therefore,the number of panicles per plant and the yield per plant could be increased by increasing the length of flag leaf,and the seed yield of Elymus nutans could be increased.