Evaluation of Heat Tolerance of Different Potato Varieties (Lines)

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.