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. 2014:2014:308042.
doi: 10.1155/2014/308042. Epub 2014 Nov 16.

Heritability and genetic advance among chili pepper genotypes for heat tolerance and morphophysiological characteristics

Magaji G Usman  1 , M Y Rafii  2 , M R Ismail  2 , M A Malek  3 , Mohammad Abdul Latif  4
Affiliations

Heritability and genetic advance among chili pepper genotypes for heat tolerance and morphophysiological characteristics

Magaji G Usman et al. ScientificWorldJournal. 2014.

Abstract

High temperature tolerance is an important component of adaptation to arid and semiarid cropping environment in chili pepper. Two experiments were carried out to study the genetic variability among chili pepper for heat tolerance and morphophysiological traits and to estimate heritability and genetic advance expected from selection. There was a highly significant variation among the genotypes in response to high temperature (CMT), photosynthesis rate, plant height, disease incidence, fruit length, fruit weight, number of fruits, and yield per plant. At 5% selection intensity, high genetic advance as percent of the mean (>20%) was observed for CMT, photosynthesis rate, fruit length, fruit weight, number of fruits, and yield per plant. Similarly, high heritability (>60%) was also observed indicating the substantial effect of additive gene more than the environmental effect. Yield per plant showed strong to moderately positive correlations (r = 0.23-0.56) at phenotypic level while at genotypic level correlation coefficient ranged from 0.16 to 0.72 for CMT, plant height, fruit length, and number of fruits. Cluster analysis revealed eight groups and Group VIII recorded the highest CMT and yield. Group IV recorded 13 genotypes while Groups II, VII, and VIII recorded one each. The results showed that the availability of genetic variance could be useful for exploitation through selection for further breeding purposes.

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Figures

Figure 1
Figure 1
Variation among 36 chili pepper genotypes in cell membrane thermostability.
Figure 2
Figure 2
Variation in yield per plant for 36 genotypes of Capsicum spp.
Figure 3
Figure 3
Relationship among the 36 chilli pepper genotypes based on cell membrane thermostability and yield characters using SAHN clustering on UPGMA method.
Figure 4
Figure 4
Two-dimensional graph principal component analysis showing relationship among the genotypes for cell membrane thermostability and yield.
See this image and copyright information in PMC

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