Growth, biomass allocation and photosynthesis of Rolandra fruticosa (asteraceae) in response to shade

Planta Daninha

INPA, Manaus, Brazil¹  Chagas Júnior, Aloisio F.¹  Dias-Filho, Moacyr B.¹  Embrapa Amazônia Oriental, Belém, Brazil¹ 

关键词: Specific leaf area;    leaf area ratio;    growth analysis;    tropics.;   

DOI  :  10.1590/S0100-83582000000100007

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

The effects of shade on growth, biomass allocation patterns and photosynthetic response was examined for Rolandra fruticosa (L.) Kuntze, a common perennial weed shrub in cultivated pastures and agricultural areas of Brazilian Amazonia, for plants grown in full sunlight and those shaded to 30 % of full sunlight over a 34-d period. Specific leaf area and leaf area ratio were higher for shade plants during all the experimental period. Shade plants allocated significantly less biomass to root tissue than sun plants and relative growth rate was higher in sun plants. Sun leaves had significantly higher dark respiration and light saturated rates of photosynthesis than shade leaves. The apparent quantum efficiency was higher for shade leaves, while light compensation point was higher for sun leaves. These results are discussed in relation to their ecological and weed management implications.

【 授权许可】

Unknown