The response of two secondary provenances of Jatropha curcas originated respectively from Hainan Province and Guizhou Province to heat stress treatments was investigated.The capacity of scavenging organic free radical...The response of two secondary provenances of Jatropha curcas originated respectively from Hainan Province and Guizhou Province to heat stress treatments was investigated.The capacity of scavenging organic free radical of DPPH· in both secondary provenances firstly increased and then decreased with increasing temperature,and presented one peak pattern.The peak value was at 30 ℃ in Guizhou secondary provenance and at 35 ℃ in Hainan secondary provenance,respectively.Antioxidative ability in Hainan secondary provenance was significantly higher than that in Guizhou secondary provenance under high temperature treatment(>35 ℃).The maximal photosynthetic evolution of oxygen was at 40 ℃ in Hainan secondary provenance,whereas 35 ℃ in Guizhou secondary provenance.There was little change in the maximal primary photochemical quantum efficiency(F_v/F_m)of the PSⅡ,however the non-circle PSⅡquantum efficiency(Φ_PSⅡ)and the photochemical quenching(q_P)of Hainan were obvious higher than those of Guizhou secondary provenance.The nonphotochemical quenching(NPQ)of Hainan displayed more tolerance to high temperature than that of Guizhou secondary provenance.F_o-temperature curves showed that the inflexion temperature(T_i)of Hainan and Guizhou secondary provenance was 52 ℃ and 50 ℃ respectively.The experiment results indicated that Hainan secondary provenance of J.curcas was able to maintain relative higher function of photosynthetic apparatus because of its high antioxidative ability and more stability of membrane under high temperature condition.This would be one of possible reasons that Hainan secondary provenance displayed stronger resistance to high temperature than Guizhou secondary provenance.展开更多
在刺槐引种栽培区内,共收集9个栽培产地的种子,播种育苗,对幼苗进行6种高温处理,测定其伤害度,结果表明:不同次生种源的伤害度差异显著。通过 logistic 模型拟合,伤害度与处理温度呈 S 型曲线关系;不同次生种源的半伤害温度不同,半伤害...在刺槐引种栽培区内,共收集9个栽培产地的种子,播种育苗,对幼苗进行6种高温处理,测定其伤害度,结果表明:不同次生种源的伤害度差异显著。通过 logistic 模型拟合,伤害度与处理温度呈 S 型曲线关系;不同次生种源的半伤害温度不同,半伤害温度与栽培产地的纬度呈负相关.与栽培产地的年均温呈正相关。由此得出结论:刺槐在引种栽培区内,由于长期自然和人工选择的作用,在高温适应性这个性状上.群体的遗传结构已发生了分化,形成了不同的生态型,为刺槐次生种源的进一步研究提供了理论依据。展开更多
文摘The response of two secondary provenances of Jatropha curcas originated respectively from Hainan Province and Guizhou Province to heat stress treatments was investigated.The capacity of scavenging organic free radical of DPPH· in both secondary provenances firstly increased and then decreased with increasing temperature,and presented one peak pattern.The peak value was at 30 ℃ in Guizhou secondary provenance and at 35 ℃ in Hainan secondary provenance,respectively.Antioxidative ability in Hainan secondary provenance was significantly higher than that in Guizhou secondary provenance under high temperature treatment(>35 ℃).The maximal photosynthetic evolution of oxygen was at 40 ℃ in Hainan secondary provenance,whereas 35 ℃ in Guizhou secondary provenance.There was little change in the maximal primary photochemical quantum efficiency(F_v/F_m)of the PSⅡ,however the non-circle PSⅡquantum efficiency(Φ_PSⅡ)and the photochemical quenching(q_P)of Hainan were obvious higher than those of Guizhou secondary provenance.The nonphotochemical quenching(NPQ)of Hainan displayed more tolerance to high temperature than that of Guizhou secondary provenance.F_o-temperature curves showed that the inflexion temperature(T_i)of Hainan and Guizhou secondary provenance was 52 ℃ and 50 ℃ respectively.The experiment results indicated that Hainan secondary provenance of J.curcas was able to maintain relative higher function of photosynthetic apparatus because of its high antioxidative ability and more stability of membrane under high temperature condition.This would be one of possible reasons that Hainan secondary provenance displayed stronger resistance to high temperature than Guizhou secondary provenance.
文摘在刺槐引种栽培区内,共收集9个栽培产地的种子,播种育苗,对幼苗进行6种高温处理,测定其伤害度,结果表明:不同次生种源的伤害度差异显著。通过 logistic 模型拟合,伤害度与处理温度呈 S 型曲线关系;不同次生种源的半伤害温度不同,半伤害温度与栽培产地的纬度呈负相关.与栽培产地的年均温呈正相关。由此得出结论:刺槐在引种栽培区内,由于长期自然和人工选择的作用,在高温适应性这个性状上.群体的遗传结构已发生了分化,形成了不同的生态型,为刺槐次生种源的进一步研究提供了理论依据。
