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ARS Home » Southeast Area » Mississippi State, Mississippi » Crop Science Research Laboratory » Corn Host Plant Resistance Research » Research » Publications at this Location » Publication #374727

Research Project: Enhanced Resistance of Maize to Aspergillus flavus Infection, Aflatoxin Accumulation, and Insect Damage

Location: Corn Host Plant Resistance Research

Title: Assessing the early-season vigor of a diverse rice population by using morphophysiological traits

item JUMAA, SALAH - Mississippi State University
item KAKAR, NAQEEBULLAH - Mississippi State University
item REDONA, EDILBERTO - Mississippi State University
item LONE, AJAZ - Sher-E- Kashmir University Of Agricultural Sciences & Technology Of Jammu
item CHASTAIN, DARYL - Mississippi State University
item GAO, WEI - Colorado State University
item Warburton, Marilyn
item REDDY, K RAJA - Mississippi State University

Submitted to: SABRAO J. of Breeding and Genetics
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/16/2020
Publication Date: 9/14/2020
Citation: Jumaa, S.H., Kakar, N., Redona, E.D., Lone, A.A., Chastain, D., Gao, W., Warburton, M.L., Reddy, K. 2020. Assessing the early-season vigor of a diverse rice population by using morphophysiological traits. SABRAO J. of Breeding and Genetics. 52(3):248-270.

Interpretive Summary: Rice is an important crop for global food security. The productivity of rice depends on an early establishment of a good stand of plants, that will suppress weeds and provide healthy plants to make lots of rice. This study measured many things on seedling rice plants to see which contributed to a good stand and a healthy seedling, and the results are presented here.

Technical Abstract: Early-season vigor is an important morphological determinant of the crop’s growth rate and duration that results from metric parameters like light interception and dry matter production, loss, and partitioning. Formulating screening tools to assess early-season vigor using root and shoot characteristics would be useful for identifying genotypes with superior performance during the juvenile growth stages. A two-year study was conducted using a sunlit pot-culture set-up to assess genetic variation among 100 rice genotypes for shoot and root traits, and several physiological parameters at the seedling growth stage (25-30 DAS). Since there was no significant year or experimental period x genotype interaction for the traits measured, the two year-data were combined for each genotype. Individual (IVRI) and cumulative response indices (CVRI) were estimated for each trait for all genotypes. Genotypes were classified into different categories using CVRI values and standard errors. The majority of the genotypes exhibited low vigor (43%), followed by moderate (33%), and very low (16%) genotypes. However, five and three genotypes showed high- and very-high vigor, respectively. The CVRI values varied from a low of 21.36 for RU1404196 to 36.17 for N-22, the most vigorous genotype. The high vigor genotypes could be valuable genetic resources for developing new varieties with early-season vigor as well as for physiological studies on canopy development for optimum light interception and weed competitiveness. The information and methods generated from this study can be used to identify high-vigor rice in rice breeding programs.