Intergenotypic Competition and Competition with Associated Crops in Cassava
            <sup>1</sup>

Kawano, Kazuo; Thung, M.

doi:10.2135/cropsci1982.0011183x002200010013x

Cited by 30 publications

(14 citation statements)

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“…It is possible that competition was more intense in pure stands of CH seedlings than in pure CL stands and that yield-reduction was consequently greater. Other studies have shown that plant varieties that are the best competitors in mixture may have reduced yields in pure stands (e.g., Hamblin and Donald, 1974;Kawano and Thung, 1982). Ifthis is the case for jewelweeds, then greater vigor of CH seedlings may actually lead to decreased estimates of inbreeding depression when the two seed types are grown in dense pure stands.…”

Section: Discussionmentioning

confidence: 99%

ENHANCEMENT OF INBREEDING DEPRESSION BY DOMINANCE AND SUPPRESSION IN IMPATIENS CAPENSIS

1990

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Abstract. -We investigated the effect of intraspecific competition on the magnitude of inbreeding depression in Impatiens capensis by planting seeds from chasmogamous (CH) and cleistogamous (CL) flowers in three experimental greenhouse treatments: in individual pots, in flats in dense pure stands according to seed type, and in flats with the two seed types intermixed in a checkerboard array. The size distributions ofplants grown in flats were significantly more hierarchical than those of plants grown individually, indicating that larger plants competitively suppressed smaller plants in the high-density treatments. The magnitude of inbreeding depression at high density depended upon the planting arrangement of CL and CH seeds. CH advantage was greatest when CH and CL seedlings were grown in competition with one another, suggesting that fitness differences between outcrossed and inbred individuals were intensified by dominance and suppression. For plants grown individually, the effects of maternal parent, seed weight, and emergence date on seedling size disappeared with plant age, whereas at high density these effects remained at the final harvest. Thus, plant density may influence patterns of natural selection both on mating system and on juvenile traits in natural Impatiens populations.

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Section: Discussionmentioning

confidence: 99%

ENHANCEMENT OF INBREEDING DEPRESSION BY DOMINANCE AND SUPPRESSION IN IMPATIENS CAPENSIS

1990

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“…ns nonsignificant difference group. Past studies in cassava indicate the usefulness of treating yield as a function of biomass and harvest index (Cock et al 1979;Kawano and Thung 1982;Cock 1983Cock , 1987Kawano and Jennings 1983;Kawano 1987Kawano , 1990Tan 1987). Williams (1974) pointed out that cultivars, which distributed the greater proportion of dry matter to the roots, also accumulated a greater total amount of dry matter, with roots primarily accounting for the additional accumulation in dry matter.…”

Section: Discussionmentioning

confidence: 99%

Genetic analysis and QTL mapping of early root bulking in an F1 population of non-inbred parents in cassava (Manihot esculenta Crantz)

Okogbenin

Fregene

2002

Theor Appl Genet

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The genetic basis of early bulking in cassava was studied in a replicated, multi-locational trial using 144 F1 progeny derived from an intra-specific cross between two non-inbred parents. A second, sequential harvest experiment examined the relative importance of eight yield-related traits on early bulking and their QTLs during the crop growth cycle. Our objectives were to identify traits, and genes controlling them, strongly associated with early yield as a first step to marker-assisted improvement of the trait. Multiple linear regression analysis and stepwise regression of early yield on eight yield-related traits revealed harvest index, dry foliage weight and root diameter as the most important factors associated with early yield. A total of 18 QTLs controlling early yield were identified in the first and second experiments and 27 QTLs, 2 for dry foliage weight, 8 for harvest index and 17 for root diameter, in the second experiment. The individual effects of alleles at these QTLs identified ranged from 7% to 33% of the phenotypic variance explained. Seven of 18 QTLs found for early yield (39%) coincided with QTLs associated with one or more traits with significant influence on early yield. The results show that sink and source capacities are very important in determining early yield. The identification of a number of QTLs with positive effect for increased early yield provides an opportunity for marker-assisted selection and improvement of early bulking potential in cassava.

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“…In cassava the competitive ability of each genotype was highly correlated with stem and leaf weight of the same genotype in monoculture (r = (Kawano & Thung, 1982 ;Kawano & Jennings, 1983) ; Rice (Kawano et al ., 1974 ;Kawano & Jennings, 1983) ; Wheat (Syme, 1970 ;McEwan, 1973 ;Donald & Hamblin, 1976) ; Barley (Singh, 1971) ; Oat (Sims, 1963) ; Groundnut (Duncan et al, 1978) ; Maize (Yamaguchi, 1974), Field bean (CTAT, 1977(CTAT, , 1978 ; Soybean (Buzzell & Buttery, 1977) . first group, exemplified by cassava, includes crops in which I holds a universal importance to Y over a wide range of environmental conditions .…”

Section: Behavior Of Yield Characters In Genetic Mixturementioning

confidence: 99%

Harvest index and evoluation of major food crop cultivars in the tropics

Kawano¹

1990

Euphytica

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Intergenotypic Competition and Competition with Associated Crops in Cassava ¹

Cited by 30 publications

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ENHANCEMENT OF INBREEDING DEPRESSION BY DOMINANCE AND SUPPRESSION IN IMPATIENS CAPENSIS

ENHANCEMENT OF INBREEDING DEPRESSION BY DOMINANCE AND SUPPRESSION IN IMPATIENS CAPENSIS

Genetic analysis and QTL mapping of early root bulking in an F1 population of non-inbred parents in cassava (Manihot esculenta Crantz)

Harvest index and evoluation of major food crop cultivars in the tropics

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Intergenotypic Competition and Competition with Associated Crops in Cassava 1

Cited by 30 publications

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ENHANCEMENT OF INBREEDING DEPRESSION BY DOMINANCE AND SUPPRESSION IN IMPATIENS CAPENSIS

ENHANCEMENT OF INBREEDING DEPRESSION BY DOMINANCE AND SUPPRESSION IN IMPATIENS CAPENSIS

Genetic analysis and QTL mapping of early root bulking in an F1 population of non-inbred parents in cassava (Manihot esculenta Crantz)

Harvest index and evoluation of major food crop cultivars in the tropics

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Intergenotypic Competition and Competition with Associated Crops in Cassava ¹