赤霉素和光对拟南芥种子萌发和幼苗生长的影响  

Effects of Gibberellin and Light on Seed Germination and Seedling Growth of Arabidopsis

作　　者：李凤玲[1] 陈季楚[1] 赵毓橘[1] 

机构地区：[1]中国科学院上海植物生理研究所,上海200032

出　　处：《植物生理学报（0257-4829)》2000年第2期101-104,共4页Acta Phytophysiologica Sinica

基　　金：国家自然科学基金资助项目!(No39870051)

摘　　要：以拟南芥的赤霉素 (GA)缺陷型突变体ga 1,ga 2 ,ga 3和GA不敏感型突变体ga i为材料 ,研究了光和 4种GA对拟南芥种子萌发和幼苗生长影响的相互关系。结果表明 :(1)烯效唑对ga i种子萌发的抑制在光下可明显被GA恢复 ,而在黑暗中GA的作用不明显。 (2 )在光下低浓度的外源GA3 可使ga 1,ga 2和ga 3的种子萌发 ,而在黑暗中同样浓度的GA3 则难以使种子萌发。 (3)光可以降低种子萌发所需求的GA的剂量。 (4 )ga i和ga 1的幼苗的呼吸代谢有明显差异。以上结果说明ga 1, ga 2, ga 3 are gibberellin deficient Arabidopsis mutants, ga i is a gibberellin insensitive mutant. The relationship between the role of gibberellin and light during seed germination and seedlings was investigated. Inhibition of ga i germination by uniconazole and prohexadione was recovered partially by application of GA 3 in light, but not in the dark (Figs.1,2). GA 3 was active inducing ga 1, ga 2 and ga 3 germination in light,but not in the dark (Fig.4). Light lowered GA concentration required for germination from 10 -4 mol/L in the dark to 10 -6 mol/L in light (Fig.3). The respiratory metabolism of ga 1 was different from ga i and wild type (Ler) (Table 1). These results show that light might increased sensitivity of Arabidopsis seed to exogenously applied GA rather than the capacity to synthesize GAs

关 键 词：赤霉素 拟南芥 种子萌发 幼苗生长 

分 类 号：Q945[生物学—植物学]