Efficiency of physiological trait-based and empirical selection approaches for drought tolerance in groundnut

Nigam, S. N., Chandra, S., Sridevi, K. Rupa, Bhukta, Manohar, Reddy, A. G. S., Rachaputi, Nageswara Rao, Wright, G. C., Reddy, P. V., Deshmukh, M. P., Mathur, R. K., Basu, M. S., Vasundhara, S., Varman, P. Vindhiya and Nagda, A. K. (2005) Efficiency of physiological trait-based and empirical selection approaches for drought tolerance in groundnut. Annals of Applied Biology, 146 4: 433-439.

Author Nigam, S. N.
Chandra, S.
Sridevi, K. Rupa
Bhukta, Manohar
Reddy, A. G. S.
Rachaputi, Nageswara Rao
Wright, G. C.
Reddy, P. V.
Deshmukh, M. P.
Mathur, R. K.
Basu, M. S.
Vasundhara, S.
Varman, P. Vindhiya
Nagda, A. K.
Title Efficiency of physiological trait-based and empirical selection approaches for drought tolerance in groundnut
Journal name Annals of Applied Biology   Check publisher's open access policy
ISSN 0003-4746
Publication date 2005-07
Sub-type Article (original research)
DOI 10.1111/j.1744-7348.2005.040076.x
Volume 146
Issue 4
Start page 433
End page 439
Total pages 7
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell
Language eng
Formatted abstract Drought is the major abiotic constraint affecting groundnut productivity and quality worldwide. Most breeding programmes in groundnut follow an empirical approach to drought resistance breeding, largely based on kernel yield and traits of local adaptation, resulting in slow progress. Recent advances in the use of easily measurable surrogates for complex physiological traits associated with drought
tolerance encouraged breeders to integrate these in their selection schemes. However, there has been no direct comparison of the relative efficiency of a physiological trait-based selection approach (Tr) vis-à-vis an empirical approach (E) to ascertain the benefi ts of the former. The genetic material used in the present study originated from three common crosses and one institute-specific cross from four collaborating institutes in India (total seven crosses). Each institute contributed six genotypes and each followed both the Tr and E selection approaches in each cross. The field trial of all selections, consisting of 192 genotypes (96 each Tr and E selections), was grown in 2000/2001 in a 4 × 48 alpha design in 12 season × location environments in India. The selection efficiency of Tr relative to E, RETr, was estimated using the genetic concept of response to selection. Based on all the 12 environments, the two selection methods performed more or less similarly (RETr = 1.045). When the 12 environments were grouped into rainy season and post-rainy season, the relative response to selection in Tr method was higher in the rainy than in the post-rainy season (RETr = 1.220 vs 0.657) due to a higher genetic variance, lower G × E, and high h2. When the 12 environments were classified into four clusters based on plant extractable soil-water availability, the selection method Tr was superior to E in three of the four clusters (RETr = 1.495, 0.612, 1.308, and 1.144) due to an increase in genetic variance and h2 under Tr in clustered environments. Although the crosses exhibited significant differences for kernel yield, the two methods of selection did not interact signifi cantly with crosses. Both methods contributed more or less equally to the 10 highest-yielding selections (six for E and four for Tr). The six E selections had a higher kernel yield, higher transpiration (T), and nearly equal transpiration efficiency (TE) and harvest index (HI) relative to four Tr selections. The yield advantage in E selections came largely from greater T, which would likely not be an advantage in water-deficient environments. From the results of these multi-environment studies, it is evident that Tr method did not show a consistent superiority over E method of drought resistance breeding in producing a higher kernel yield in groundnut. Nonetheless, the integration of physiological traits (or their surrogates) in the selection scheme would be advantageous in selecting genotypes which are more efficient water utilisers or partitioners of photosynthates into economic yield. New biotechnological tools are being explored to increase effi ciency of physiological trait-based drought resistance breeding in groundnut.
Keyword Selection efficiency
Peanut breeding
Genotype x environment interaction
Trait-based selection
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
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