Importance of secondary traits in improvement of maize ( Zea mays L.) for enhancing tolerance to excessive soil moisture stress

Zaidi, P. H. and Maniselvan, P. and Sultana, R. and Yadav, M. and Singh, R. P. and Singh, S. B. and Dass, S. and Srinivasan, G. (2007) Importance of secondary traits in improvement of maize ( Zea mays L.) for enhancing tolerance to excessive soil moisture stress. Cereal Research Communications, 35 (3). pp. 1427-1435. ISSN 0133-3720

[img] Text
Restricted to Repository staff only until 30 September 2027.

Download (111kB)


Selection on the basis of grain yield per se for improved performance under excessive moisture stress has often been misleading and considered inefficient. We assessed the importance of secondary traits of adaptive value under waterlogging stress. During the 2000–2004 summer-rainy seasons twelve trials were conducted and a total of 436 tropical/subtropical inbred lines (S <sub>4</sub> –S <sub>n</sub> ) were evaluated under excessive soil moisture stress. Excessive moisture treatment was applied at V <sub>6–7</sub> growth stage by flooding the experimental plots continuously for seven days. Different phenological and physiological parameters were recorded before, during and either immediately or 1–2 weeks after exposure to stress. Excessive moisture conditions significantly affected all the morphological and physiological traits studied. However, there was significant genetic variability for various traits, especially for root porosity and brace root development that were induced under excessive moisture. Across the trials, significant genetic correlations (p<0.01) was obtained between grain yield and different secondary traits, including ears per plant, root porosity, brace root fresh weight, number of nodes with brace roots and anthesis silking interval. Broad-sense heritability decreased under excessive moisture stress conditions for most of the traits; however, it increased significantly for root porosity, nodal root development and ears per plant. Our findings suggest that consideration of these second-ary traits during selection of maize germplasm for excessive moisture tolerance can improve selection efficiency and genetic gains.

Item Type: Article
Subjects: S Agriculture / mezőgazdaság > S1 Agriculture (General) / mezőgazdaság általában
Depositing User: Barbara Payer
Date Deposited: 01 Dec 2017 12:07
Last Modified: 01 Dec 2017 12:07

Actions (login required)

Edit Item Edit Item