紫花苜蓿新品系MS-LM01的抗旱性初步鉴定

为阐明紫花苜蓿新品系MS-LM01的抗旱性,采用盆栽断水法模拟土壤干旱胁迫,设置三个水分梯度,研究不同紫花苜蓿品种响应干旱的形态和生理特征.结果表明:随着胁迫程度的增加,各品种的株高、根粗、生物量、叶片相对含水量、叶绿素含量、净光合速率都呈明显的下降趋势,而脯氨酸含量呈增加趋势.与其他4个品种相比,MS-LM01在轻度干旱(LS)和重度干旱(SS)处理下株高、生物量、根粗、叶片相对含水量、脯氨酸含量、净光合速率等对干旱胁迫的敏感程度较小.隶属值综合分析显示抗旱能力大小依次为陇东MS-LM01甘农3号金皇后中苜1号.表明新品系MS-LM01具有较强的抗旱性以及优良的农艺性状,这对干旱地区紫花苜蓿品种的选择以及抗旱性紫花苜蓿品种的选育具有重要意义.

Preliminary identification on drought resistance of alfalfa varieties and new line MS-LM01

In order to elucidate drought resistance of alfalfa new line MS-LM01. Pot culture and water control were used to imitate drought stress, three water treatments were set up to study the morphological and physiological characteristics responses of different alfalfa varieties. This study indicated that the increase of soil drought conditions resulted plant height, root width, biomass, leaf relative water content, chlorophyll content and net photosynthetic rate were decreased, whereas increase proline content. In comparison, plant height, biomass, root width, relative water content, net photosynthetic rate and proline content of MS-LM01 in light stress(LS) and severe stress(SS) were less sensitive for drought stress. Comprehensive subordinate function value analysis suggested that drought resistant order was Longdong>MS-LM01>Gannong No.3>Golden Empress > Zhongmu No.1. The results showed that the new line MS-LM01 had strong drought resistance and better agronomic performance, which was great significance to the selection of alfalfa varieties and the breeding of drought-resistant alfalfa varieties in arid area.