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.
Highlights
The global temperature increase is projected to range, depending on the location, between 1.5 ̊C and 11 ̊C by the year 2100 [1]
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
The highest rate of increase in plant height was found in a parental line “Billings”, and the lowest rate was observed in a Buster line “DH231” followed by another parental line “Duster”
Summary
The global temperature increase is projected to range, depending on the location, between 1.5 ̊C and 11 ̊C by the year 2100 [1]. The high temperature at the beginning of spring season, coinciding with anthesis and grain-filling stages of the wheat crop, substantially reduces grain number and size [2]. This leads to a decrease in overall wheat productivity. Several studies have screened genotypes for heat tolerance [3] [4] [5] Most of these studies have considered either the whole plant life cycle or the post-anthesis period of crop growth. Screening plants for the heat tolerance traits at early plant growth stages can help shorten the time period of the selection process, shortening breeding cycles and increasing genetic gain at a reduced time and cost. We screen 100 genotypes from a double haploid population for heat tolerance at the vegetative growth stage based on morpho-physiological traits
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