摘要
为探明德钦苜蓿对根际高温胁迫的响应,采用二因素随机区组设计,恒温和变温各设5个温度和5个取样时间,分析根际温度对云南地方品种德钦苜蓿形态特征和水分状况的影响。结果表明:根际高温影响德钦苜蓿的外观质量。根际温度高于25℃时德钦苜蓿的株高、总叶数和叶宽的累计增长率减小,地上部分生长受到抑制; 25-30℃时根系的长度及根毛新生显著增加,两者的增幅分别介于13. 93%-40. 69%和2 283. 31%-4 868. 58%之间; 40±胁迫72h后,植株上部叶片失水萎靡、反卷,下部叶片完全黄化、焦枯、脱落,地下部分变细、变软,停止新生根产生,40℃为德钦苜蓿生长的上限温度。叶片和根系的相对含水量随胁迫温度的升高和胁迫时间的延长而下降,但根系相对含水量降幅较叶片小;此时叶片和根系的相对电导率升高。
To reveal the response of Medicago sativa L. under high rhizosphere temperature stress,by using two factors randomized block design,5 temperatures and 5 sampling time under constant and variable temperature,this study analyzed the morphological characteristics and water status of Medicago sativa L.‘Deqin’under different rhizosphere temperature. The results showed that visual quality of alfalfa was influenced by high rhizosphere temperature. The accumulative growth rate of plant height,total number of leaves and leaf width of alfalfa decreased while the rhizosphere temperature was higher than 25℃,and the growth of aboveground part would be inhibited.However,the root length and roots regeneration significantly increased at 25-30℃, with ranging 13. 93%-40. 69% and 2 283. 31%-4 868. 58%,respectively. Leaves were dehydration and revolute at top of plant but etiolation,defoliation and scorch at bottom,furthermore,roots were thinner and softer than before and no new roots growth anymore at 40℃ after 72 h treatment,and the ceiling temperature was 40℃ for alfalfa growth. The relative water content of leaves and roots decreased with the increasing of stress temperature and the prolongation of stress time,but the decrease rate of roots was a little bit slighter than that of leaves,meanwhile the electrolytic leakage of leaves and roots were increased.
作者
李孟南
张誉稳
毕玉芬
赵雁
LI Meng-nan;ZHANG Yu-wen;BI Yu-fen;ZHAO Yan(College of Horticulture and Landscape,Yunnan Agricultural University,Kunming Yunnafi 650201,P.R.China;College of Animal Science and Technology,Yunnan Agricultural University,Kunming Yunnan 650201,P.R.China)
出处
《西部林业科学》
CAS
北大核心
2018年第6期22-29,共8页
Journal of West China Forestry Science
基金
国家自然科学基金项目(31660683)
云南省教育厅科研基金项目(2016YJS060)
关键词
根际温度
高温胁迫
德钦苜蓿
二因素随机区组设计
形态特征
水分状况
rhizosphere temperature
high temperature stress
‘Deqin'Medicago sativa L
two factors randomized block design
morphological characteristics
water status
