植物生态学报 ›› 2012, Vol. 36 ›› Issue (8): 841-848.doi: 10.3724/SP.J.1258.2012.00841

• 研究论文 • 上一篇    下一篇

野豌豆属4种植物种子萌发的积温模型分析

胡小文, 王娟, 王彦荣*   

  1. 草地农业生态系统国家重点实验室, 兰州大学草地农业科技学院, 兰州 730020
  • 收稿日期:2012-03-16 修回日期:2012-06-16 出版日期:2012-08-01 发布日期:2012-08-21
  • 通讯作者: 王彦荣 E-mail:yrwang@lzu.edu.cn
  • 基金资助:

    几种豆科种子田间休眠释放调控的生理生态机制

Thermal time model analysis for seed germination of four Vicia species

HU Xiao-Wen, WANG Juan, and WANG Yan-Rong*   

  1. State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
  • Received:2012-03-16 Revised:2012-06-16 Online:2012-08-01 Published:2012-08-21
  • Contact: WANG Yan-Rong E-mail:yrwang@lzu.edu.cn

摘要:

以青藏高原野豌豆属窄叶野豌豆(Vicia angustifolia)、山野豌豆(V. amoena)、歪头菜(V. unijuga) 3种野生植物与一种当地栽培植物救荒野豌豆(箭筈豌豆) (V. sativa) ‘兰箭3号’种子为材料, 在5、10、15、20、25及30 ℃下进行萌发实验, 应用种子萌发的积温模型对上述4种植物萌发对温度的响应特征进行了比较分析。结果表明: 1)基于萌发速率(1/Tg)对种子萌发温度最低温Tb值的估计受萌发率(g)的影响较小; 与此不同, 除‘兰箭3号’种子外, 对萌发最高温Tc值的估计, 受到g的显著影响。这表明种群内所有种子个体萌发的Tb值相对恒定, 但Tc值在有些物种中变异较大; 2)基于重复概率单位回归分析估计的种子萌发Tb值与基于萌发速率估计的值较为接近; 而由此方法估计的Tc值则与萌发率为50%时的估计值较为接近; 3)相比多年生豆科植物歪头菜和山野豌豆, 一年生豆科植物箭筈豌豆‘兰箭3号’与窄叶野豌豆具有相对较低的TbTc值; 4)积温模型可准确地预测休眠破除后豆科植物种子在不同温度条件下的萌发进程。

Abstract:
Aims The study aimed to: 1) investigate the accuracy of thermal time model in predicating seed germination response to temperature for different legume species after dormancy release; 2) compare temperature requirements for seed germination of different legume species from the Qingzang Gaoyuan.
Methods The seeds of four Vicia species were germinated over the constant temperature range of 5–30 °C at 5 °C interval. The effects of temperature on seed germination were summarized in terms of the thermal time model for germination.
Important findings The base temperature (Tb) did not differ significantly within each sub-population by regressing germination rate on sub-optimal temperatures. In contrast with Tb, the ceiling temperature (Tc) differed significantly within each sub-population by regressing germination rate on supra-optimal temperature in all species except Vicia sativa. These imply the base temperature for all individual seeds in the populations were relative constant, but the ceiling temperatures may vary within the sub-populations. Tb value estimated by repeated probit analysis was quite close to the value estimated by regressing germination rate within sub-optimal temperatures; however, Tc value estimated by this method was close to the value estimated with T50. Compared to two perennial legume species, annual legume species had lower Tb and Tc. The thermal model was accurate to predict the germination time course under different temperatures.