TITLE:
Morpho-Physiological Characterization of Winter Wheat “Buster” Population during the Vegetative Stage under Heat Stress
AUTHORS:
Pratishtha Poudel, Vijaya Gopal Kakani, Phillip D. Alderman, Brett F. Carver
KEYWORDS:
Wheat, Breeding, Buster, Heat Stress, Morphological, Photosynthesis, Physiological
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.11 No.8,
August
21,
2020
ABSTRACT: Phenotypic assessment of breeding population is
important to identify robust lines for incorporating into future breeding
programs. The objective of this study was to identify potential lines from a
wheat (Triticum aestivum L.) population, based on their morpho-physiological traits, for improved heat
tolerance. A subset of 100 lines of the double haploid (DH) population named
“Buster”, developed from two successful Oklahoma wheat varieties (Billings and
Duster), was used in the study. Two
experiments were conducted one in a greenhouse and the other in growth
chambers. Data on plant height, tiller number, leaf number, and photosynthetic
pigments were collected from the greenhouse; whereas the data on physiological
parameters (leaf net photosynthesis (Pn), transpiration (T), stomatal
conductance (gs), intercellular carbon dioxide concentration (Ci),
electron transport rate (ETR), Photosystem II efficiency (Fv'/Fm') and instantaneous water
use efficiency (IWUE)) were collected from the growth chambers. Buster lines
were significantly (P 2 m-2·s-1. The differences in leaf physiological
parameters were more discernible under heat stress. This study provides a piece
of baseline information on morpho-physiological characteristics of Buster
lines, and identified lines can be used in future breeding programs for
incorporating heat stress tolerance.