Location: Grain Quality and Structure Research
Project Number: 3020-44000-026-02-S
Project Type: Non-Assistance Cooperative Agreement
Start Date: Sep 1, 2017
End Date: Aug 31, 2022
The objective is to identify the effects of physiological traits resulting from exposure to abiotic stresses on wheat grain biochemical constituents (e.g. protein and starch).
We will use recombinant inbred line (RIL) population (180 lines) derived from crossing heat tolerant and heat resistant parents subjected to heat stress during reproductive stages. TAMU will assess physiological parameters such as the content of leaf epicuticular wax, chlorophyll fluorescence, stomatal conductance, leaf temperature and spectral reflectance indices. Grain chemistry and compositional analysis from these samples will be analyzed by ARS. Additionally a Multiparent Advanced Generation Intercross (MAGIC) derived winter wheat genetic mapping population segregating for a combination key agronomic, morphological, phenological, and physiological traits will be used to define yield and end-use quality stability. TAMU is breeding for ethylene insensitivity as heat stress yield loss is potentially induced by embryo derived ethylene which triggers early programmed cell death in the endosperm. The grain chemical constituents (e.g protein and starch) will be analyzed to unravel the dynamics behind protein and starch build up during grain filling and composition on physiological traits resulting from exposure to abiotic stresses.