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Cross-virility in two tropical tree species: evidence of inbreeding depression within this populations and you can genetic divergence certainly one of communities †

Опубликовано в рубрике rencontres-desactivees visitors | мая 8, 2023

Cross-fertility in 2 exotic forest species: proof inbreeding anxiety inside populations and you can hereditary divergence certainly communities †

The writer thank you so much S. Gunatilleke and you can Letter. Gunatilleke within Agencies of Botany, University of Peradeniya getting advice and you will logistic help; the brand new Tree Agency away from Sri Lanka having consent so you’re able to conduct which really works within the Sinharaja Community Society Webpages; the fresh new Botany Institution, College or university away from Peradeniya to be used of their business; S. Harischandran, H. Gamage, and you can M. Gunadasa to have help with hand-pollinations; and you can S. Harischandran and A. Anura having tending greenhouse seedlings. P. Ashton, K. Bawa, Letter. Gunatilleke, J. Hamrick, L. Kaufman, and you will J. Mitton given of good use talks; P. Ashton, S. Dayanandan, and you may C. Schneider mentioned toward earlier drafts; and you may B. Wieninger aided with the data. Which really works try offered in part by the money from the new Maintenance, Food, & Fitness Base, Inc.

Abstract

Understanding the spatial activities from get across-fertility when you look at the natural plant populations yields key insight into biparental inbreeding anxiety, separation by the point, and, fundamentally, speciation. Around three people all of a couple of tropical forest types (Syzygium rubicundum and Shorea cordifolia) was indeed for each and every entered having four conspecific pollen donors between worry about in order to woods taking place for the separate forest reserves (a dozen and you may 35 km distance for S. rubicundum and you will Sh. cordifolia, respectively). Cross-fertility is projected given that good fresh fruit put, seed products germination, and you may seedling survivorship and you can level during the 1 yr. Technique of very cross-fertility steps enhanced gradually that have outcrossing range, peaking from the step 1–2 km to own S. rubicundum and 1–ten kilometres to possess Sh. cordifolia, after which decreasing during the anywhere between-tree crosses. But not, seed products germination and you can seedling height to have Sh. cordifolia ideal crossbreed vigor in between-tree crosses. The new indicate physical fitness price of nearest-neighbors mating in line with crossing with more distant residents is 45% having S. rubicundum and you may 0% to have Sh. cordifolia. The new indicate fitness cost of between-forest crosses try 52% and 70% toward a few varieties. Crossing outcomes to your fitness reduced involving the degrees out-of fruits place and step 1-yr-dated seedlings. Results mean a strong prospect of inbreeding depression within tree tree populations and you will partial reproductive isolation among forests when you look at the Sri Lanka’s damp area.

Estimating cross-virility during the numerous spatial bills within an extract species’ assortment lets understanding of the necessity of genetic incompatibility and you can inbreeding and you can outbreeding anxiety not as much as natural conditions. In the less spatial balances, the newest restricted seeds dispersal attribute of numerous vegetation is to end up in relatedness certainly close-residents in sheer communities. Where surrounding flowers try relevant, mating between natives (i.elizabeth https://www.datingranking.net/fr/rencontres-desactivees., biparental inbreeding; Uyenoyama, 1986) can lead to less reproductive fitness on account of inbreeding depression otherwise genetic incompatibility ranging from mates. When you are designs regarding good-measure hereditary relatedness was shown for a number of herbaceous variety (elizabeth.grams., Epperson and you will Clegg, 1986; Waser, 1987; Schoen and you will Latta, 1989), for woody species, including angiosperms, studies toward within-people genetic build was limited. Some research has shown spatial clustering from adult genotypes (otherwise alleles) inside creature-pollinated tree woods (Acer saccharum-Perry and you may Knowles, 1991; Swartzia simplex-Hamrick, Murawski, and you can Nason, 1993; Quercus rubra-Sork, Huang, and you can Wiener, 1993; Quercus laevis-Berg and you may Hamrick, 1995; Cordia alliodora-Boshier, Pursue, and you can Bawa, 1995), although some failed to help with the new expectation out of hereditary relatedness one of surrounding people (Psychotria nervosa-Dewey and you can Heywood, 1988; Alseis blackiana and you may Platypodium elegans-Hamrick, Murawski, and you may Nason, 1993). Regardless of models away from relatedness, mating might be limited to regional communities inside the herbaceous species (Levin and you can Kerster, 1974; Endler, 1979; Waser and Speed, 1983) plus woody variety, particularly when blooming people is clustered (Linhart, 1973; Stacy et al., 1996). The chance of biparental inbreeding depression in sheer populations has been exhibited for a number of herbaceous and you may coniferous forest varieties (Coles and Fowler, 1976; Playground and Fowler, 1982; Levin, 1984; Schemske and you may Pautler, 1984; McCall, Mitchell-Olds, and you will Waller, 1991; Heywood, 1993; Waser and you can Rates, 1994; Trame, Coddington, and you can Paige, 1995; Byers, 1998). Little or no is known, although not, out-of biparental inbreeding despair inside natural populations from woody angiosperms.