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银合欢种子萌发特性及其影响因素研究

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为了解银合欢Leucaena leucocephala的种群扩散机制,并为其规模化繁殖育苗和生态修复上的合理利用提供技术支持,研究分析其3 种成熟阶段果实和种子的形态特征、鲜重和含水量,种子在不同温度、光照中的萌发情况,以及播种基质和6-BA、GA3 溶液对种子萌发的影响.结果表明:幼嫩荚果的种子粒数最多,平均为19.30 粒,含水量最高,为61.88%;中熟荚果的鲜重最大,为42.09 g.幼嫩种子的含水量最高,为73.10%;中熟种子的鲜重最重,百粒重为 7.04 g.种子在 25℃和常温(昼 25～35℃/夜18～25℃)的萌发率和萌发指数最高,为萌发的较适温度,且光照下萌发率显著比黑暗高,种子为需光性种子.中熟种子萌发率和萌发指数最高,其次是幼嫩种子,完熟种子最小.将完熟种子播种于不同基质中,出苗率最高的为营养土,其次是园土,砂中最低.100 mg/L GA3 和10 mg/L 6-BA溶液浸泡24 h对完熟种子的萌发具有显著的促进作用(P＜0.05),而300～700 mg/L的GA3 和30～70 mg/L浓度的 6-BA溶液反而有抑制作用.
Study on Seed Germination Characteristics and Its Influencing Factors of Leucaena leucocephala
In order to understand the population diffusion mechanism of Leucaena Leucocephala and pro-vide technical support for its large-scale breeding and rational utilization in ecological restoration,the morpho-logical characteristics,fresh weight and water content of pods and seeds of L.leucocephala at three different mature stages,the seed germination at different temperatures and light conditions,and the influence of sowing substrates,soaking in 6-BA and GA3 solutions were studied.The results showed that the immature pods had the largest number of 19.30 grains and the highest water content of 61.88％and the largest fresh weight of 42.09 g,and the medium-ripe pods had the maximum fresh.weight of 42.09 g.The young seeds had the highest water content,73.10％,and moderate mature seeds had the heaviest fresh weight,with 100-grain weight of 7.04 g.The germination rate and germination index were the highest at 25℃ and room temperature(Day 25-35℃/night 18-25℃),which was the more appropriate temperature for germination,and the germination rate was significantly higher than that in the light,and the seeds were light-demanding seeds.The moderate mature seeds had the highest germination rate and germination index,followed by immature seeds and the full mature seeds had the smallest.The full mature seeds were sown in different substrates,and reached the highest seedling yield in vegetative soil,followed by garden soil and the lowest in sand.Soaking of 100 mg/L GA3 and 10 mg/L 6-BA solutions for 24 h significantly promoted the germination of full mature seeds(P<0.05),whereas 300-700 mg/L GA3 and 30-70 mg/L 6-BA solutions instead inhibited them.

Leucaena leucocephalaseed germinationtemperatureilluminationseeding substrateplant hormones

林玲玲、黄梦玲、吴锦丽、杨期和

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嘉应学院,广东 梅州 514015

银合欢 种子萌发 温度 光照 播种基质 植物激素

嘉应学院大学生创新创业训练项目广东省科技创新和乡村振兴战略专项高等教育"冲补强"提升计划重点建设学科(农业资源与环境)建设项目教育厅自然科学研究项目

嘉院校办[2023]23号2021A0305粤科教函[2018]81号2019KTSCX171

2024

林业与环境科学
广东省林学会,广东省林业科学研究院

林业与环境科学

影响因子：0.62
ISSN：1006-4427
年,卷(期)：2024.40(3)
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