Floret morphology of sorghum midge-resistant sorghum Academic Article uri icon

abstract

  • Differences in sorghum, Sorghum bicolor (L.) Moench, spikelet characteristics at the time ovipositing sorghum midges, Stenodiplosis sorghicola (Coquillett), are in the field have been proposed as a major cause of resistance. Ovipositing sorghum midges were most abundant on particles of susceptible RTx430 sorghum (7.6 per panicle) and least abundant on resistant sorghums (mean of 2.7). Percentages of kernels that failed to develop were greater for susceptible (62.9) than resistant sorghums (25.7). Sorghum midge-resistant sorghums as a group had shorter stigmas (0.92 mm), filaments (0.96 mm), and anthers (1.80 mm), but wider (0.70 mm) and longer (1.03 mm) ovaries than did susceptible sorghums (1.27, 1.24, 2.09, 0.67, and 0.96 mm, respectively). However, these differences were not consistent among individual genotypes. Sorghum midge abundance and damage were highly significantly correlated. But, abundance of sorghum midges and resulting damage were not consistently correlated with sizes of sorghum floral parts. This lack of consistent correlation, especially for individual sorghum genotypes, indicated differences in sizes of floral parts are not as important as time and tightness of glume closure as a major cause of sorghum resistance to sorghum midge.

author list (cited authors)

  • Diarisso, N. Y., Pendleton, B. B., Teetes, G. L., Peterson, G. C., & Anderson, R. M.

publication date

  • March 1998