全球气候变化对温带果树的影响

目的评价不同马铃薯品种(系)的耐热性。方法以22份马铃薯品种(系)为研究材料，马铃薯出苗后分别对其进行26、30 ℃的高温胁迫，以22 ℃为对照；分别处理20、40 d后，测定株高、叶面积、茎粗、结薯数、相对电导率、丙二醛(MDA)和脯氨酸(Pro)含量，采用隶属函数法对马铃薯耐热性进行评价。结果不同马铃薯品种(系)对高温的响应各不相同，随着处理温度的升高，马铃薯总体表现为株高、叶片相对电导率、MDA含量和Pro含量增加，植株茎粗和叶面积减小，结薯数减少；30 ℃高温胁迫下的叶面积明显小于对照和26 ℃高温胁迫，且随着处理时间的延长，相对电导率也随之增大。隶属函数综合排序前5位为镇薯1号、滇薯187、青薯10号、云薯401和滇同薯1号。结论隶属函数综合排序前5位的品种(系)对高温的耐受性较强，可作为进一步研究马铃薯耐热性的良好试验材料，为揭示高温胁迫下马铃薯的抗性机制奠定基础。

Variability for high temperature tolerance in bread wheat

PurposeTo evaluate the heat resistance of different potato varieties (lines).MethodThere will be 22 potato varieties (lines) used as research materials. After emergence of photoes, they were controlled at 26 ℃ and 30 ℃, respectively, at 22 ℃ as CK. After 20 days and 40 days treatment, the plant height, leaf area, stem diameter, potato number, relative conductivity, malondialdehyde (MDA) and proline (Pro) were evaluated by the membership function method.ResultDifferent potato varieties (lines) responded differently to high temperature. With the increase of temperature, the most of potatoes became high and leaf relative conductivity, MDA content and Pro content increased; the leaf area reduced; the number of potatoes reducde. The leaf area under high temperature stress at 30 ℃ was significantly lower than that in CK and 26 ℃ high temperature stress, and the relative conductivity increase with the treatment time. The membership function values in the top five were ZS1, D187, QS10, YS401 and DTS1. ConclusionThese five potato varieties (lines) were tolerant to high temperature; these varieties (lines) can be used as a good experimental material to further study the heat tolerance of potato, which lays a foundation for revealing the resistance mechanism of potato under high temperature stress.