Effect of heat stress during seed development and maturation on wheat (Triticum durum) seed quality

Abstract

Stewart, for their support and ideas which enabled me to complete this study. My extended thanks and appreciations go to Dr. J.S.Burris who was always there to give his insight and steer me in the proper direction. Dr. Burris, I appreciate the opportunity you gave me, accepting me as one of your students to expand my knowledge in seed physiology. To my fellow graduate students, the seed science staff, and all my friends, I would like to thank you for all your help and for the fxui times we had together. I am truly going to miss you all. My deepest thanks go to my family (Mom, Dad, Brothers, Sisters, and Relatives) for their continual support and patience. I am mostly deeply indebted to my wife, Mina for her encouragement, support, tolerance, understanding and love. Your patience and faith made this all possible, I love you. Finally, I dedicate this dissertation to my daughter, Wissal, who came to lighten my life and from whom I received enjoyments and love during the completion of my graduate studies, I love you.

Smooth bromegrass seed yield and yield component responses to seeding rates and row spacings in two climates

“…We seeded same Table 6. number of SFt in Jiuquan and tongliao for the three experimental years (2010)(2011)(2012) High seed quality is associated with higher seed weight (Grass and Burris, 1995;Trupp and Carlson, 1971). Although the three-year SY for smooth bromegrass was comparable for Jiuquan and Tongliao, TSW for seed produced at Jiuquan was significantly higher than that produced at Tongliao.…”

Kernel Development in Wheat

“…One of the most important environmental factors affecting plant growth and development is temperature (Grass and Burris, 1995). Several studies have shown that temperature has an impact on the linear grain filling period.…”

“…Several studies have shown that temperature has an impact on the linear grain filling period. While an increase in postanthesis air temperatures causes a moderate increase in the rate of grain growth (Chowbury and Wardlaw, 1978), many studies have shown that increased temperatures have a negative impact on yield (Grass and Burris, 1995; Woodruff and Tonks, 1983).…”

“…Optimum development temperature in wheat is 59°F (Chowbury and Wardlaw, 1978). Nevertheless, in many of the wheat‐producing regions of the world, temperatures exceed this optimum during part of the growing season and reduce grain yield and quality (Grass and Burris, 1995). Banowetz et al (1999) performed a postanthesis (1–7 days) treatment at a day/night temperature of 95/77°F, which reduced kernel weight and number on the primary spike.…”

“…Grass and Burris (1995) examined the effect of heat stress on durum wheat ( Triticum turgidum L.) and found that regardless of cultivar differences, seeds maturing under temperatures 46 to 61°F higher weighed less than those produced under cooler conditions. Hunt et al (1991) also found that wheat plants exposed to high temperatures shortly after anthesis produced smaller kernels.…”