持绿型高粱B35灌浆期对干旱的生理生化响应  

Physiological and Biochemical Responses to Drought during Filling Stage in Stay Green Sorghum B35

作　　者：黄瑞冬[1] 孙璐[1] 肖木辑[1] 许文娟[1] 周宇飞[1] 

机构地区：[1]沈阳农业大学农学院,辽宁沈阳110161

出　　处：《作物学报》2009年第3期560-565,共6页Acta Agronomica Sinica

基　　金：国家科技支撑计划项目(2006BAD02B00);辽宁省教育厅资助项目(20060768)资助

摘　　要：在盆栽条件下,对典型持绿型高粱品系B35在开花后10d和开花后30d进行1周的干旱胁迫,胁迫结束后测定与持绿性或抗旱性相关的生理生化指标。结果表明,持绿型高粱品系B35与对照普通高粱品系三尺三相比,具有较高的叶绿素含量(SPAD值)、净光合速率(Pn)和叶片、茎秆、籽粒含氮量,且干旱胁迫使其值下降幅度较小。与对照相比,干旱胁迫条件使B35叶片的相对电导率和丙二醛(MDA)含量增加量较少,游离脯氨酸含量的增加量较多,叶水势下降幅度较大。B35的超氧化物歧化酶(SOD)和过氧化物酶(POD)活性均较高。因此,我们认为在干旱逆境中持绿型高粱品系B35能够在光合作用、氮素积累、叶片质膜透性、渗透调节能力和保护酶活性等方面有效进行自身的生理调节,以适应干旱胁迫。Effects of drought on a typical stay green sorghum line B35 were investigated through analyzing the physiological and biochemical characteristics of sorghum plants with the treatments of weekly drought stress starting on the 10th day and the 30th day after anthesis respectively in pot experiment. Compared with CK, the stay green sorghum B35 showed higher chlorophyll content （SPAD value）, photosynthetic rate and nitrogen content in leaf, stem and grain. Under the condition of drought stress, the increments of electrical conductivity rate, malondialdehyde content in B35 were less than those in CK, the increments of proline contents and decrements of leaf water potential in B35 were more than those in CK. The activities of superoxide dismutase （SOD） and peroxydase （POD） of B35 were higher than those of CK. We suggested that the stay green sorghum line could perform the physiological autoregulation effectively at the aspects of photosynthesis, nitrogen accumulation, cell membrane permeability of leaf, osmoregulation ability and activities of protective enzymes to adapt the drought.

关 键 词：高粱 持绿性 抗旱性 生理生化特性 

分 类 号：S514[农业科学—作物学]