Impact of elevated CO sub(2) concentration on ultrastructure of pericarp and composition of grain in three Triticum species of different ploidy levels

Triticum species of three ploidies were grown under ambient (375 mu l/l) or elevated (FACE, 550 mu l/l) CO sub(2) concentration [CO sub(2)] to evaluate their response to CO sub(2) enrichment. The consistent effect of elevated CO sub(2) was an increase in concentration of starch and decrease in conce...

Full description

Saved in:
Bibliographic Details
Published in:Environmental and experimental botany 2009-09, Vol.66 (3), p.451-456
Main Authors: Sinha, Pooja Gokhale, Kapoor, R, Uprety, D C, Bhatnagar, A K
Format: Article
Language:English
Subjects:
Triticum
Triticum dicoccoides
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Triticum species of three ploidies were grown under ambient (375 mu l/l) or elevated (FACE, 550 mu l/l) CO sub(2) concentration [CO sub(2)] to evaluate their response to CO sub(2) enrichment. The consistent effect of elevated CO sub(2) was an increase in concentration of starch and decrease in concentration of protein in the grain. Transmission electron micrographs revealed an increase in width and area of chloroplasts, and change in shape from elliptical in ambient to round in elevated [CO sub(2)]. There was a corresponding increase in starch grain size and number in chloroplasts. The large starch grains distributed among thylakoids resulted in separation and distortion of internal membrane system in chloroplasts. The level of response was different in species of different ploidy levels. Maximum increase in starch concentration, and least decrease in protein concentration, was observed in Triticum dicoccoides, which also proved the most suitable species in terms of C:N ratio.
ISSN:0098-8472
DOI:10.1016/j.envexpbot.2009.04.006