Intermediate morphophysiological dormancy allows for life-cycle diversity in the annual weed, Turgenia latifolia (Apiaceae)
Intermediate morphophysiological dormancy allows for life-cycle diversity in the annual weed, Turgenia latifolia (Apiaceae)
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DOI：
10.1071/bt14281
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发表时间：
2014
影响因子：
1.1
通讯作者：
M. Nurulla;C. Baskin;C. Baskin;Juanjuan Lu;D. Tan;J. Baskin;J. Baskin
中科院分区：
文献类型：
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作者：
M. Nurulla;C. Baskin;C. Baskin;Juanjuan Lu;D. Tan;J. Baskin;J. Baskin
研究了宽叶山慈菇种子打破休眠的要求和生活史类型。在7月的传播中，只有0-9%的种子在5/2°C、15/2°C、20/10°C和25/15°C下发芽;因此，91%的种子表现出生理休眠（PD），9%的种子是非休眠的。此外，胚不发达，胚长：种子长度比从新鲜种子的0.38增加到萌发时的0.79。在4种温度条件下埋于干土中12周的种子，在5/2°C黑暗条件下发芽率≥50%，在15/2°C和20/10°C条件下埋于干土中12周的种子，在15/2°C条件下发芽率≥50%。种子具有中间复杂的形态生理休眠（MPD）。PD在高温和/或低温下被打破，但胚生长仅在低温下完成;赤霉素（GA 3）促进发芽。在夏季自然条件下埋下的种子在5/2°C和15/2°C下分别发芽至约70%和约55%，在秋季黑暗中。在发芽物候研究中，秋季和春季的累积发芽率分别为~20%和~80%。中间复杂的MPD允许该物种表现为冬季一年生植物和短暂的夏季一年生植物。
Our aim was to determine the seed dormancy-breaking requirements and type of life cycle of Turgenia latifolia in north-western China. At dispersal in July, only 0–9% of the seeds germinated at 5/2°C, 15/2°C, 20/10°C and 25/15°C; thus, 91% of the seeds exhibited physiological dormancy (PD) and 9% were non-dormant. Also, the embryo was underdeveloped and embryo length : seed length ratio increased from 0.38 in fresh seeds to 0.79 at germination. Seeds buried in dry soil at the four temperature regimes for 12 weeks germinated to ≥50% when tested in darkness at 5/2°C, and those buried at 15/2°C and 20/10°C germinated to ≥50% when tested at 15/2°C. Seeds have intermediate complex morphophysiological dormancy (MPD). PD was broken at high and/or low temperatures, but embryo growth was completed only at low temperatures; gibberellic acid (GA3) promoted germination. Seeds buried under natural conditions during summer germinated to ~70% and ~55% at 5/2°C and 15/2°C, respectively, in darkness in autumn. In a germination-phenology study, cumulative germination was ~20% and ~80% in autumn and spring, respectively. Intermediate complex MPD allows the species to behave as a winter annual and as a short-lived summer annual.