
复羽叶栾树植冠种子库种子活力变化机制
刘相泉, 赵仁菲, 朱艳芳, 邓仕明, 李吉涛, 邓志军
南京林业大学学报(自然科学版) ›› 2023, Vol. 47 ›› Issue (2) : 35-41.
复羽叶栾树植冠种子库种子活力变化机制
Mechanisms of seed vigour changes in the canopy seed bank of Koelreuteria bipinnata
【目的】探明植冠种子库中种子活力变化的生理生态机制,准确认识植冠种子库的生态意义。【方法】以复羽叶栾树(Koelreuteria bipinnata)植冠种子库为研究对象,在果实进入成熟期后每隔一定时间从植冠种子库中采集种子,分别进行萌发测试,种子干质量、含水量、浸出液电导率、丙二醛(MDA)含量测定,以及超氧化物歧化酶(SOD)、抗坏血酸过氧化物酶(APX)、过氧化氢酶(CAT)、脱氢抗坏血酸还原酶(DHAR)等4种主要抗氧化酶活性的测定,并对种子萌发率和各生理指标进行相关性分析。【结果】在研究期内,复羽叶栾树植冠种子库中的种子先后经历了生理成熟、成熟脱水、休眠诱导和休眠解除4个生理时期;各生理时期的种子总体上在模拟的秋季变温条件下萌发最好,其次为春季变温,再次为夏季变温;完成成熟脱水的种子在植冠种子库中宿存期间始终保持着高活力水平;4种抗氧化酶的活性与模拟的春、夏、秋季节变温条件下的萌发率间具有显著或极显著的正相关性,且均随着种子休眠的诱导而下降,随着种子休眠的解除而升高,表明抗氧化酶在植冠种子库中种子活力的获得和保持中起着重要的积极作用,并证实了种子休眠与萌发的“胚胁迫学说”。【结论】本研究促进了对植冠种子库的深入认识,还发现复羽叶栾树植冠种子库中种子具有较强的活力保持能力,建议在森林经营管理和植被恢复中充分利用其植冠种子库。
【Objective】 This study explored physiological and ecological mechanisms of seed vigor change in the canopy seed bank of Koelreuteria bipinnata in order to accurately understand the ecological significance of canopy seed banks.【Method】 A canopy seed bank of K. bipinnata was used as the object of study, and seeds were collected from the canopy seed bank at certain time intervals after fruits entered the ripening period. We then conducted a germination test and determined the seed dry mass, water content, malondialdehyde content, and activities of SOD, APX, CAT and DHAR. Finally, we performed an analysis between the germination percentage and physiological indices.【Result】 During the study duration, seeds in the canopy seed bank experienced four physiological periods, including physiological maturity, mature dehydration, dormancy induction and release. The seeds in each physiological period generally had the best germination under simulated autumn alternative temperatures, followed by spring alternative temperatures and summer alternative temperatures. The vigor of the seeds was maintained at a high level after mature dehydration was finished, and the four antioxidases played a significant positive role in the acquisition and maintenance of seed vigor, being significantly positive correlative with the germination percentages under simulated spring, summer and autumn alternative temperatures. Moreover, they all decreased with the induction of seed dormancy and increased with the release of dormancy, which also confirmed the “Embryo stress theory” of seed dormancy and germination.【Conclusion】 This study not only promotes further understanding of the canopy seed banks, but also finds that seeds in the canopy seed bank of K. bipinnata have a strong ability to maintain vigor. Full use of canopy seed banks in forest management and vegetation restoration should be encouraged.
复羽叶栾树 / 植冠种子库 / 种子活力 / 休眠 / 萌发 / 抗氧化酶
Koelreuteria bipinnata / canopy seed bank / seed vigour / dormancy / germination / antioxidative enzyme
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