Effect of plant density on selection for seed yield in two population types of Phaseolus vulgaris L.

Common bean (Phaseolus vulgaris L.) is an economically significant seed crop in tropical regions. With the objective of studying the effect of plant density on growth and yield characteristics of common bean, four common bean varieties (‘GLP190S’, ‘NITU’, ‘ECOPALM021’ and ‘NUA99’) collected from IRAD-Cameroon and four plant spacing distances (10 cm x 10 cm, 15 cm x 15 cm, 20 cm x 20 cm and 30 cm x 30 cm) corresponding respectively to four plant density (121, 49, 36 and 16 plants/m2) were evaluated for twelve quantitative traits in a randomly completed block design with three repetitions. ANOVA and correlation analysis were performed. Means values of each trait from the ANOVA analysis was submitted to the Tukey test at 5% probability level. The effect of variety was significant for all the twelve studied traits except the number of seed per plant. Pod length, plant height, number of seeds per pod and 100 seed weights were not affected by plant density while the numbers of seeds per plant, number of pods per plant, biological and seed yield were significantly affected by plant density. Interaction effect of plant variety and plant density on seed yield, biological yield, number of pods per plant and collar diameter was significant. No positive correlation was found between plant density and any of the studied traits. Leaf width, collar diameter, number of functional leaves and number of pods per plant inversely correlated with plant density. At the lowest plant density (16 plant/m2), seed yield and biological yield correlated poorly with related quantitative traits comparing to higher plant densities. From all the studied varieties, only ‘ECOPALM021’ showed the seed yield not affected by plant density. This study also showed that the higher seed yield and important biological yield was at 16 plants/m2 plant density.

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Mapping QTL for seed yield and canning quality following processing of black bean (Phaseolus vulgaris L.)

Euphytica ◽

10.1007/s10681-011-0369-2 ◽

2011 ◽

Vol 179 (3) ◽

pp. 471-484 ◽

Cited By ~ 36

Author(s):

E. M. Wright ◽

J. D. Kelly

Keyword(s):

Phaseolus Vulgaris ◽

Seed Yield ◽

Phaseolus Vulgaris L ◽

Black Bean ◽

Mapping Qtl ◽

Canning Quality

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Relations of carbon isotope discrimination and other physiological traits to yield in common bean (Phaseolus vulgaris) under rainfed conditions

The Journal of Agricultural Science ◽

10.1017/s0021859600087463 ◽

1994 ◽

Vol 122 (2) ◽

pp. 275-284 ◽

Cited By ~ 31

Author(s):

J. W. White ◽

J. A. Castillo ◽

J. R. Ehleringer ◽

J. A. C. Garcia ◽

S. P. Singh

Keyword(s):

Phaseolus Vulgaris ◽

Carbon Isotope ◽

Water Deficit ◽

Seed Yield ◽

Combining Ability ◽

Carbon Isotope Discrimination ◽

Isotope Discrimination ◽

Rainfed Conditions ◽

Mechanisms Of Adaptation ◽

Selection For

SUMMARYAlthough direct selection for seed yield under water deficit can result in genetic gains in the common bean (Phaseolus vulgaris L.), progress could be enhanced through selection for additional traits that are related to underlying mechanisms of adaptation to water deficit. Carbon isotope discrimination (Δ) has received considerable attention as an indicator of water use efficiency and adaptation to water deficit. To test the utility of Δ as a selection criterion, Δ and other traits were measured in F2 and F3 generations of a nine-parent diallel grown under rainfed conditions at two locations in Colombia with contrasting soil types. An irrigated trial was also conducted at one location. Significant (P 0·05) differences among parents, F2 and F3 were found for carbon isotope discrimination (Δ), leaf optical density (OD), leaf nitrogen (N) and potassium (K) concentrations, relative duration of pod-filling period (RDPF), shoot dry weight (SDW) and harvest index (HI). Effect of location and water regime and their interactions with genotype were also frequently significant. Heritability estimates, determined by regressing the F3 on the F2, ranged from 0·11±011 (S.E.) to 0·33 ±0·10 for OD, 0·22 ± 0·07 to 0·44±0·09 for N, 0·04±0·05 to 0·29±0·08 for K, 0·40 ± 0·08 to 0·43 ± 0·15 for RDPF and 0·30±0·22 to 1·00±0·24 for SDW. All values for Δ and HI did not differ significantly from zero. Correlations between seed yield and OD and RDPF were negative, whereas those with N, K, SDW, and HI were positive. For all traits, mean square values for general combining ability (GCA) were usuall significant and larger than those for specific combining ability (SCA). All significant GCA effects for Δ for ‘Rio Tibagi’, ‘San Cristobal 83’ and ‘Apetito’ were negative, while those for ‘Bayo Rio Grande’, ‘Bayo Criollo del Llano’, ‘Durango 222’ and BAT1224 were positive. Although Δappears unsuitable as an indirect criterion for selection for yield under water deficit, further study of genotypes exhibiting contrasting values of A might reveal differences in mechanisms of adaptation to water deficits, thus leading to other selection criteria or identification of valuable parental lines.

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