Morphological, growth, and photosynthetic responses of cottonwood hybrid 47-174 (Populus trichocarpa x P. deltoides) to nitrogen fertilization and leaf rust infection
Year: 2012
Type: dissertation
Abstract: The growth, morphological, and photosynthetic responses of cottonwood hybrid 47-174 to nitrogen (N) stress and leaf rust stress and their interaction are summarized herein.High nitrogen (HN) fertilization enhanced growth and photosynthesis as compared to low nitrogen (LN).HN plants developed more and larger leaves, were taller, had greater diameters, and greater dry weights as compared to LN plants.Leaves were developmentally identified by the leaf plastochron index (LPI) system.Subdividing LPIs into 4 structural-functional segments (SFS 1-4) facilitated sampling of the major stages of leaf development of this plant.Indirect measures of leaf nitrogen found higher values in HN than LN plants.However, in both plants leaf nitrogen levels were lowest in SFS 1, the top segment with newly formed leaves, and were high in the three other segments: SFS 2 -newly matured leaves, SFS 3 -fully matured leaves, and SFS 4 -mature, senescening leaves.Both HN and LN plants were susceptible to Melampsora leaf rust infection.Scanning electron microscopy (SEM) of both HN and LN rust infected leaves illustrated the morphological impact of rust infection.
Author: Jaime F. Banaag
Language: English
Subfield: Molecular Biology
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2244328525