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Relationship of "Bloomless" (bm bm) Sorghum to Greenbug Resistance¹

Parental, F₁ and F₂ sorghum [Sorghum bicolor (L.) Moench] populations involving the bloomless trait were studied for their reaction to greenbugs (Schizaphis graminum Rondani). Plants were grown in pots in the greenhouse, classified into bloom or bloomless (presence or absence of white wax on leaf sheath) categories, rated for greenbug damage, and studied for tolerance, anti. biosis, and non preference. The objective of the researchwas to learn more about the nature of the resistance of bloomless sorghum to greenbugs since bloomless may be useful in commercial sorghums.

Bloomless was inherited as a simple recessive with complete dominance of bloom. The tolerance to damage of ‘Shalin Grain’ and ‘IS 809’ by greenbugs was inherited independently of the bloomless trait. The bloomless plants did not exhibit greenbug tolerance as did Shallu Grain and IS 809, except where the two traits were combined in an F₂ individual plant. Bloomless plants showed only slightly more of an antibiotic effect on greenbugs than the susceptible check and significantly less than the resistance check. In this study, bloomless plants 50 to 70 days old exhibited a significant nonpreference to greenbugs compared to the susceptible check.

Key Words: Sorghum bicolor (L.) Moench • Waxy bloom • Inheritance • Tolerance • Antibiosis • Non-preference • Schizaphis graminum(Rondani)

² Former graduate students, Dep. of Agronomy; professor, Dep. of Agronomy; research leader, SEA-USDA; associate professor, Dep. of Statistics, respectively, Oklahoma State Univ., Stillwater, OK 74074,

Received for publication May 23, 1979.