Growth regulation characteristics of current-year shoots of Fraxinus sogdiana in Yili River Valley
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摘要:
目的 当年生枝条是木本植物进行种群空间扩展、结实和光合作用的主要部位，反映种群进化和适应调节等重要生态学特征。研究当年生枝条的生长调节特征，可揭示植物种群的适应机制。 方法 通过分析国家Ⅱ级保护植物小叶白蜡Fraxinus sogdiana的长枝、中枝和短枝3种不同类型枝条各构件之间的异速生长关系，对不同类型枝条功能的差异性及其在种群适应调节中的作用进行研究。 结果 不同类型枝条的叶片和茎之间具有不同的生长规律，其中在总叶面积和茎生物量关系上，长枝和中枝上均为同速生长关系(斜率分别为1.170和1.135)，而在短枝上为异速生长关系(斜率为0.657)；在叶片生物量和茎生物量分配关系上，长枝、中枝和短枝分别表现为异速、同速、异速生长关系，回归方程的斜率依次为1.460、0.908和0.840。共同表明长枝和中枝具有更高的叶片生长能力，功能上侧重于扩展空间和光合生产，短枝的功能与有性繁殖过程有关。叶轴对叶片生长也有调节作用，在中枝和短枝上能够弥补茎对叶面积支持效率的不足，但在长枝上作用不明显。 结论 小叶白蜡的长枝和中枝具有更高的叶片支持效率，其功能不仅体现在扩展种群生长空间方面，同样也体现在较高的光合生产能力方面，当年生枝条具有更为复杂的功能分化，在种群适应调节中的作用更加多样化，建议在研究具有二态性枝条的植物生长调节特征时，应考虑枝条类型的差异性。图3表3参37 Abstract:Objective The current-year shoots, as the main parts of woody plants for population spatial expansion, fruiting and photosynthesis, are the most vigorous modulars and reflect the important ecological characteristics of population evolution and adaptive regulation. Therefore, this study, with an investigation into the growth regulation characteristics of current year branches, is aimed to reveal the adaptive mechanism of plant population. Method An analysis was conducted of the allometric growth relationships among the modulars of three types of shoots (long shoot, medium shoot and short shoot) of Fraxinus sogdiana, a plant of second-class protection in China, so as to explore the functional differences of different types of branches and their roles in population adaptation and regulation. Result Leaves and stems of different types of shoots are featured with different growth rules with allometric growth on long shoot and medium shoot (slope was 1.170 and 1.135 respectively), and isokinetic growth on short shoot (slope was 0.657) in terms of total leaf area and stem biomass. Isokinetic, allometric and isokinetic growth rules apply on long shoot, medium shoot and short shoot when it comes to the relationship between leaf biomass and stem biomass with the slope of regression equation being 1.460, 0.908 and 0.840 respectively. The long shoot and the medium shoot had higher leaf growth ability and mainly functioned in the expansion of space and photosynthetic production whereas the short shoot was more involved in the sexual reproduction process. Leaf rachis can also regulate leaf growth, making up for the lack of stem support efficiency for leaf area on medium shoot and short shoots, yet with no obvious effect on long shoots. Conclusion The long and medium shoots of F. sogdiana have higher leaf support efficiency, and their functions are not only reflected in expanding the population growth space, but also in higher photosynthetic production capacity. The current year shoots of F. sogdiana demonstrate more complex functional differentiation, with their roles in population adaptation regulation being more diverse, implying that shoot types should be considered in future studies dealing with the characteristics of plant growth regulation with dimorphic shoots. [Ch, 3 fig. 3 tab. 37 ref.] -
Key words:
- Fraxinus sogdiana /
- biomass allocation /
- population regulation /
- allometric growth /
- modular /
- Yili River Valley
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图 1 小叶白蜡当年生枝条的茎和叶片异速生长分析
Figure 1 Allometric growth analysis of stem and leaf of F. sogdiana shoot
图 2 小叶白蜡当年生枝条的叶轴和叶片异速生长分析
Figure 2 Allometric growth analysis of rachis-leaf of F. sogdiana shoot
表 1 小叶白蜡当年生枝条的茎与叶片回归方程参数及显著性检验
Table 1. Parameters and significance test of stem-leaf regression equations of F. sogdiana shoot
茎与叶片 变量 斜率 截距 R2 回归方程
P值异速生长
检验P值复叶片数-
茎生物量长枝 0.879 a 0.858 0.617 0.000 0.014 中枝 0.750 a 1.083 0.661 0.000 0.013 短枝 0.330 b 1.236 0.708 0.000 0.000 单个小叶面
积-茎生物量长枝 0.836 a 0.411 0.003 0.771 − 中枝 0.735 a 0.688 0.077 0.138 − 短枝 0.397 b 0.938 0.326 0.001 0.000 总叶面积-
茎生物量长枝 1.170 a 1.601 0.398 0.000 0.922 中枝 1.135 a 1.903 0.513 0.000 0.343 短枝 0.657 b 2.174 0.591 0.000 0.001 说明：斜率后不同字母表示同一指标在不同类型枝条间差异显著(P＜0.05)。–表示回归方程不显著，不进行异速生长检验 
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表 2 小叶白蜡当年生枝条的叶轴与叶片回归方程参数及显著性检验
Table 2. Parameters and significance test of rachis-leaf regression equations of F. sogdiana shoot
叶轴与叶片 变量 斜率 截距 R2 回归方程
P值异速生长
检验P值复叶片数-
叶轴生物量长枝 0.601 a 1.403 0.436 0.000 0.000 中枝 0.829 a 1.395 0.389 0.000 0.002 短枝 0.353 b 1.368 0.468 0.000 0.000 单个小叶面积-
叶轴生物量长枝 0.571 ab 0.929 0.024 0.423 − 中枝 0.812 a 0.994 0.002 0.154 − 短枝 0.424 b 1.097 0.273 0.003 0.000 总叶面积-
叶轴生物量长枝 0.800 b 2.326 0.368 0.000 0.107 中枝 1.255 a 2.376 0.431 0.000 0.119 短枝 0.701 b 2.437 0.436 0.000 0.016 说明：斜率后不同字母表示同一指标在不同类型枝条间差异显著(P＜0.05)。−表示回归方程不显著，不进行异速生长检验
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表 3 小叶白蜡当年生枝条生物量分配的回归方程参数及显著性检验
Table 3. Parameters and significance test of regression equations for biomass allocation of F. sogdiana shoot
生物量分配 变量 斜率 截距 R2 回归方程
P值异速生长
检验P值茎生物量-
叶轴生物量长枝 0.683 b 0.620 0.508 0.000 0.007 中枝 1.105 a 0.417 0.748 0.000 0.299 短枝 1.067 a 0.400 0.643 0.000 0.570 叶总生物量-
茎生物量长枝 1.459 a −0.303 0.512 0.000 0.008 中枝 0.908 b 0.243 0.817 0.000 0.242 短枝 0.840 b 0.327 0.799 0.000 0.048 说明：斜率后不同字母表示同一指标在不同类型枝条间差异显著(P＜0.05)
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