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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #125368
Title: CULTIVAR RESPONSE TO ARSENIC-INDUCED STRAIGHTHEAD IN RICE

Author
item Yan, Wengui
item DILDAY, R - USDA ARS RETIRED
item SLATON, N - UNIV ARK
item GIBBONS, J - UA RREC
item MOLDENHAUER, K - UA RREC

Submitted to: American Society of Agronomy
Publication Type: Abstract Only
Publication Acceptance Date: 8/1/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Straighthead is a physiological disorder of rice (Oryza sativa L.) that results in blank florets, and in extreme cases, the panicles do not form. Consequently, severe straighthead can result in almost total loss of yield Cultivars that show tolerance to arsenic in the form of applied monosodium methanearsonate (MSMA) also appear to be tolerant to straighthead. Twelve cultivars, including 10 of the most popular U.S. cultivars, a Chinese line and a Japanese accession, were evaluated for straighthead induced by MSMA (6.7 kg/ha) in 1999 and 2000. On a scale of 1 (low susceptibility) to 9 (high susceptibility), 'Cocodrie', 'Kaybonnet', 'Bengal' and 'Mars' were the most susceptible. The straighthead rating of the four ranged from 7.1 to 8.0 and yield reduction ranged from 83 to 98%. 'Priscilla' and 'Jefferson' were the most tolerant, indicated by ratings of 4.5 and 5.1, and yield reduction of 38% and 46%, respectively. 'Cypress', 'Drew', 'Wells', 'LaGrue' and japan 92.9.31 were intermediate. 'Zhe 733', a Chinese germplasm accession, was almost immune to straighthead with a rating of 1.9 and a slight yield reduction of 6%. Rice producers may want to select a tolerant cultivar to plant on land with a history of straighthead, Zhe 733 may be useful as a genetic donor to improve the tolerance to straighthead in U.S. rice production.