Leaf dynamics in growth and reproduction of Xanthium canadense as influenced by stand density.

ABSTRACT:

Background and aims

Leaf longevity is controlled by the light gradient in the canopy and also by the nitrogen (N) sink strength in the plant. Stand density may influence leaf dynamics through its effects on light gradient and on plant growth and reproduction. This study tests the hypothesis that the control by the light gradient is manifested more in the vegetative period, whereas the opposite is true when the plant becomes reproductive and develops a strong N sink.

Methods

Stands of Xanthium canadense were established at two densities. Emergence, growth and death of every leaf on the main stem and branches, and plant growth and N uptake were determined from germination to full senescence. Mean residence time and dry mass productivity were calculated per leaf number, leaf ar

SUBMITTER: Ogawa T 

PROVIDER: S-EPMC4590326 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature