Sex allocation and mating systems in pigeonpea,Cajanus cajan (Fabaceae)

Cumaraswamy, Arunthathi; Bawa, Kamaljit S.

doi:10.1007/bf00936107

Cited by 16 publications

(14 citation statements)

References 16 publications

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“…In Gilia achielleifolia (Schoen 1982), Oryza perennis (Charnov 1987), Bromus spp. (Mckone 1987) and Cajanus cajan (Cumraswamy and Bawa 1989), resources allocated to male function have been found to reduce with increase in selfing rate. Similar trend obtains in species of Plantago also.…”

Section: Discussionmentioning

confidence: 99%

Pattern of Resource Allocation of Six Plantago Species with Different Breeding Systems

1999

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Species of Plantago exhibit great deal of differences in the breeding system. The reproductive effort calculated on the basis of, (i) dry biomass of foliar and floral parts and (ii) seed output-weight (mg) per unit leaf area (cm2), exhibits relation with breeding system. The predominantly inbreeding taxa invest higher reproductive effort compared to their outbreeding allies. In terms of sex allocation strategies, the outbreeding species like f . lamlafa, f , lasopus invest more to the development of floral features and to male functions. On the contrary, inbreeding species such as f . pafagmica, f. drummondii, and f . ovata invest greater resources to the female function.

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Section: Discussionmentioning

confidence: 99%

Pattern of Resource Allocation of Six Plantago Species with Different Breeding Systems

1999

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“…Uma Shaanker, Ganeshaiah, and Bawa (1988) showed that for relatively small benefits due to seed abortion, an offspring would be more selected to favor killing its siblings when they are half-sibs (r ϭ 0.25) than when they are full sibs (r ϭ 0.50). In pigeon pea, intrafruit seed abortion was positively correlated with the extent of outcrossing (Cumaraswamy and Bawa, 1989). Though there are no direct tests of the above prediction, anecdotal evidence exists that offers support for this view.…”

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confidence: 99%

“…Based on the observed patterns in the extent of abortion, seed abortion could be either variable or stringent. Seed abortion tends to increase with habit from herbs to trees and with breeding system from self to outbred (Bawa and Webb, 1984;Weins, 1984;Weins et al, 1987;Cumaraswamy and Bawa, 1989). However, in species such as Syzygium cuminii, the abortion is invariant and stringent with all trees over all locations maturing only one of the 30-35 ovules (Arathi, 1990).…”

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“…Seed abortion tends to increase with habit from herbs to trees and with breeding system from self to outbred (Bawa and Webb, 1984;Weins, 1984;Weins et al, 1987;Cumaraswamy and Bawa, 1989). The suggestion that abortion could be due to the expression of developmentally recessive lethals (Weins, 1984;Weigel and Hughes, 1986;Weins et al, 1987;Bawa et al, 1989) also does not seem to explain the observed seed abortion. Several proximate mechanisms have been put forth to explain the low seed to ovule ratio in plants.…”

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confidence: 99%

“…Several ecological correlates of seed abortion have been identified in plants. Seed abortion tends to increase with habit from herbs to trees and with breeding system from self to outbred (Bawa and Webb, 1984;Weins, 1984;Weins et al, 1987;Cumaraswamy and Bawa, 1989). Species with fruit as a unit of dispersal that are dispersed through wind, water, or animals show on average higher seed abortion than those with seeds as the unit of dispersal (Uma Shaanker, Ganeshaiah, and Bawa, 1988).…”

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Genetic relatedness among developing seeds and intra fruit seed abortion inDalbergia sissoo(Fabaceae)

Mohana

Shaanker

Ganeshaiah

et al. 2001

American J of Botany

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Dalbergia sissoo, a wind-dispersed tropical tree, exhibits high intrafruit seed abortion. Of the four to five ovules in the flower, generally one and occasionally two or three develop to maturity. It has been proposed that the seed abortion is a consequence of intense sibling competition for maternal resources and that this competition occurs as an inverse function of the genetic relatedness among the developing seeds. Accordingly, developing seeds compete intensely when they are genetically less related but tend to develop together when genetically more related. We tested this hypothesis by comparing the genetic similarity among the pairs of seeds developing within a pod with that among (a) random pairs from the pool of all seeds, (b) random pairs from single-seeded pods, and (c) random pairs from two-seeded pods, using both randomly amplified polymorphic DNA (RAPD) and isozymes in five trees. We found that the pairs of seeds developing within a pod are genetically more similar than any random pairs of seeds in a tree. Thus the formation of two-seeded pods appear to be associated with increased genetic relatedness among the developing seeds. We discuss the results in the context of possible fitness advantages and then discuss the possible mechanisms that promote tolerance among related seeds.

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Pollen‐ovule ratio, pollen size, and breeding system inAstragalus (Fabaceae) subgenusEpiglottis:a pollen and seed allocation approach

Gallardo

Domı́nguez

Muñoz

1994

American J of Botany

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The correlation between pollen/ovule (P/O) ratio and breeding system has generally been accounted for either on the basis that P/O reflects pollination efficiency, or in terms of the sex allocation theory. The following were assessed for taxa belonging to genus Astragalus subgenus Epiglottis: 1) Degree of correlation between P/O and the breeding system, measured by means of autofertility; 2) The absence or existence of correlation between P/O and pollen grain size; and 3) The ability of various theories to account for the results obtained. Results showed a minimal correlation between P/O and autofertility, and between P/O and pollen grain size in the taxa studied. Analysis of these results in terms of the sex allocation theory enabled this correlation to be explained as a function of the variation existing between taxa with respect to the resources invested in each pollen grain and in each ovule. The predictive capacity of this theory, which has moreover proven valuable in explaining the structural peculiarities of the androecium in these taxa, was also highlighted. The type of self‐pollination applicable was also discussed, as was the phenotypic model of selection of self‐fertilization considered most plausible for these taxa.

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Sex allocation and mating systems in pigeonpea,Cajanus cajan (Fabaceae)

Cited by 16 publications

References 16 publications

Pattern of Resource Allocation of Six Plantago Species with Different Breeding Systems

Pattern of Resource Allocation of Six Plantago Species with Different Breeding Systems

Genetic relatedness among developing seeds and intra fruit seed abortion inDalbergia sissoo(Fabaceae)

Pollen‐ovule ratio, pollen size, and breeding system inAstragalus (Fabaceae) subgenusEpiglottis:a pollen and seed allocation approach

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