Patterns of diversity in pigeonpea (<Emphasis Type="Italic">Cajanus cajan</Emphasis> (L.) Millsp.) germplasm collected from different elevations in Kenya |
| |
Authors: | Hari D Upadhyaya K N Reddy C L L Gowda S N Silim |
| |
Institution: | (1) Genetic Resources, Global Theme on Crop Improvement, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh, 502 324, India;(2) ICRISAT-Nairobi (Regional hub ESA), PO Box 39063, Nairobi, Kenya |
| |
Abstract: | Pigeonpea germplasm accessions collected from low (<500 m), medium (501–1000 m), high (1001–1500 m) and very high elevation
zones (>1500 m) of Kenya were evaluated for 15 agronomic traits and seed protein content at ICRISAT, Patancheru, India. There
were significant differences (P < 0.001) among elevation zones for the number of primary and secondary branches, days to 75% maturity, pod length, seeds per
pod, 100-seed weight and seed yield. Mean values indicated that the accessions from low elevation zone were significantly
different from those collected in higher elevation zones for early flowering and maturity, number of primary branches, pod
length, number of pods per plant, seeds per pod, 100-seed weight, seed yield and harvest index. None of the accessions collected
in Kenya belonged to extra early (<80 days to 50% flowering) and early (80–100 days to 50% flowering) maturity groups, as
defined by time to flowering at Patancheru, India. Mean diversity index based on all characters indicated that accessions
from the low elevation zone are more diverse than those from the higher elevation zones. Frequency distribution for trait
extremes indicated that the accessions from the low elevation zone were early to flower and mature, short statured, produced
more primary and secondary branches with high pod bearing length, long pods, more pods per plant, more seeds per pod, a high
seed yield and harvest index. Accessions from the very high elevation zone were late flowering, with a large number of tertiary
branches, large seeds and a high shelling percentage and could be a source for cold tolerance and the breeding of vegetable
types. Results suggest that the elevation of collection sites is therefore a very important determinant of variation patterns
of pigeonpea in Kenya. |
| |
Keywords: | Agronomic traits Cajanus cajan Collection sites Diversity Elevation Pigeonpea |
本文献已被 SpringerLink 等数据库收录! |
|