Agronomic traits and heat tolerance of diploid and tetraploid petunia
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摘要: 在夏季高温田间试验条件下,比较二、四倍体矮牵牛的农艺性状,并在人工控制的高温胁迫42℃/25℃(昼/夜)10d条件下研究二者的耐热性生理指标。与二倍体相比较四倍体表现出以下显著形态特征:植株长势健壮、茎粗壮、叶片增厚变大、叶色深绿,花冠、萼片、柱头和花药增大,花柱、花柄增长。在人工控制高温胁迫条件下,四倍体叶片可溶性糖、叶绿素、脯氨酸、SOD数值高于二倍体,而电解质外渗透率、MDA含量均低于二倍体。综合田间试验结合人工模拟高温试验,结果表明四倍体矮牵牛的耐热性强于二倍体。Abstract: Agronomic traits of diploid and tetraploid petunias (Petunia hybrida Vilm.) were compared under summer heat in the field. Their physiological characteristics of tolerance to heat stress were studied at 42℃/25℃ (day/night) for 10 days in a diurnal growth incubator. The apparent morphological differences between diploid and tetraploid observed included:(a) the tetraploid plant grew more vigorously; (b) its stem became bigger in diameter; (c) its leaves were denser,thicker,larger and darker green in color; (c) the corolla,calyx,stigma and anther grew larger; and (d) its style and pedicel became longer than the diploid petunias. Under the controlled heat stress,the tetraploid leaves had a lower electrolyte leakage rate and content of malondialdehyde (MDA),but higher contents of soluble sugar,total chlorophyll,proline and SOD activity than in diploid leaves. The results from both the field and the artificially controlled chamber demonstrated that the tetraploid petunia had a higher heat tolerance than its diploid counterpart.
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Key words:
- petunia /
- diploid /
- tetraploid /
- heat stress
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