油菜素内酯对低温胁迫下西瓜种子萌发及其抗氧化能力的影响

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中图分类号：S651 文献标志码：A 文章编号：1673-2871（2025）10-098-06

Abstract： Inorderto investigatetheregulatory mechanismof exogenous brassinolide（BR）on watermelon seed germinationandthelowtemperature toleranceofseedlings，thewatermelonseedvarietyB6wasusedastheexperimentalmaterial.The effects of seed soaking with different concentrations ofBR（0.0o1，0.01，0.05，0.1，1，and 5mg⋅L-1） on seed germinationandseedlinggrowthcharacteristicsunderlow temperature stresswere studied.Theresultsindicatedthatunderlow temperature stress， the 0.05mg⋅L⋅1BR treatment yielded the most favorable outcomes：The germination rate was significantly ncreased29.28percent pointscomparedwith thecontrol（distiled water）.TheactivitiesofSOD，POD，andCAT in the seedlings were significantly enhanced by 77.55% ， 72.90% ，and 54.74% ，respectively.Meanwhile，the contents of soluble protein， soluble sugar，and proline were markedly elevated by 167.43% 63.07% ，and 66.42% ，respectively. In contrast， the levelsof REC，MDA， O2-. ，and H2O2 were significantly reduced by 40.96% 50.00% 42.37% ，and 40.41% ，respectively.These findingsprovide valuable theoreticalsupportfor improving Watermelonseed germinationand enhancing seedling low temperature resistance under cold stress conditions.

Keywords：Watermelon;Brassinolide;Lowtemperature stress;Seed germination;Physiologicalcharacteristics

温度是影响植物生长的重要因素之一，尤其是对于种子来说，适宜的温度条件才能保证萌发过程中一系列生理生化作用，温度过低易导致种子发芽率低、出苗慢，并对幼苗的光合作用产生一定的抑制[-3]。（剩余8576字）