Fertility variation and its impact on seed crops in seed production areas and a natural stand of teak in southern India

Varghese, M.; Kamalakannan, R.; Nicodemus, A.; Lindgren, D.

doi:10.1007/s10681-007-9591-3

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…Teak trees in natural stands are bearing more number of fruits (Varghese et al, 2008). This is also evident in the case of A. leucophloea as it produced more number of PriBr in all study fruit production per tree varied considerably across stands.…”

Section: Growth and Reproductive Outputsupporting

confidence: 52%

“…These will have strong implications in germplasm collection, tree improvement and genetic con-As far as forest trees are concerned, viable natural stands are the starting point of domestication and a proper selection of plus trees from natural stands is obligatory for the successful operation of any tree breeding program (Gregorius and Muller, 1975). Tree growth is frequently the sole criterion for selection of seed stands (Varghese et al, 2008). Earlier, several researches have proved that fertility estimation of forest trees by assessing feasible approach for selecting good stands (Bila and Lindgren, 1998;Nikkanen and Ruotsalainen, 2000;Krouchi et al, 2004;Varghese et al, 2006;Kamalakannan et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Fertility variation among individuals in natural stands of Acacia leucophloea

et al. 2016

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Growth characteristics and fertility variations were evaluated at four natural stands of tropical arid zone species,A. leucophloeain southern India. Three stands (TNL 1, TNL 2 and PDM) were situated in dry upland regions while one stand (RKP) was at waterlogged site. The tree height and girth at breast height did not vary between stands in two years. Fertility variation (sibling coefficient, ψ) was estimated based on flowering abundance and fruit set collected for two consecutive years. Fruit production per tree was generally lower in the RKP stand than the other three stands. No year-to-year variation was observed on fruit set in all stands. Growth and flower production showed a weak-positive correlation in both years (R2= 0.39 to 0.1). The correlation to check if the larger inflorescence size, the higher number of fruit production was also failed. Male fertility variation did not vary much among stands (ψm= 1.28 ~ 1.62). Female fertility variation was low (ψf= 1.71 ~ 2.02) in the three stands situated in dry upland regions than the RKP stand (ψf= 4.09 ~ 4.16). The cumulative contribution of trees to the overall fertility was deviated from the ideal situation (equal contribution) in all stands, especially the RKP stand showed a skewed distribution (R2≤ 6.5). The effective population size was low in the RKP predicting a high genetic drift when compared with other sites. Similarly high group coancestry and low gene diversity were observed in the stand RKP. The implications of fertility variation on gene diversity of the species and future management of the natural stands were also discussed.

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Section: Growth and Reproductive Outputsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Fertility variation among individuals in natural stands of Acacia leucophloea

et al. 2016

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“…During the last four decades several studies have examined pollination (Bryndum and Hedegart 1969, Hedegart 1973, Kedarnath 1974, Tangmitcharoen and Owens 1997a, Palupi and Owens 1997, Palupi et al 2010), pollinator behavior (Tangmitcharoen et al 2006a, b, 2009), reproductive phenology (Palupi and Owens 1998), pollen germination (Egenti 1978, Tangmitcharoen and Owens 1997b), fertility variation (Varghese et al 2008) and genetic variation and mating systems (Kertadikara and Prat 1995) of this species. It has been shown that teak is a diploid, 2n = 36, (Gill et al 1983, Kertadikara and Prat 1995), hermaphroditic, self incompatible (Hedegart 1973, Tangmitcharoen and Owens 1997b) and entomophiliously out‐crossing (Bryndum and Hedegart 1969, Hedegart 1973, Kedarnath 1974) species known for poor seed production (Nagarajan et al 1996, Palupi and Owens 1998).…”

Section: Study Species: Importance and Work Done On Reproductive Biolmentioning

confidence: 99%

Annual variation in floral phenology and pollen production in a 25‐year‐old plantation of Tectona grandis

Khanduri

2012

Nordic Journal of Botany

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Teak is a timber tree that is widely distributed in the tropics. Several studies on pollination and reproductive biology have been conducted, but generally information on flowering phenology and annual variation in total pollen production per tree is lacking. The reproductive phenology as well as flower‐ and pollen grain production of individuals in a population is important to theoreticians, field biologists and plant breeders, as they determine the distribution of genotypes within populations and influences the degree of differentiation among populations. This study reports flowering phenology and variation in total flower, fruit‐ and pollen production per tree in teak in a 25‐year‐old plantation across three consecutive years (2006–2008). The results show that the date of onset and end of flowering was highly variable across years. The longest flowering period of 93 days was observed in 2006. There was an asynchrony in the number of open flowers due to differences in time of anthesis among individuals (± 2 days) and inflorescences within individuals (± 6 h). The production of pollen grains per tree in 2007 was 33%, i.e. 16% more compared to 2006 and 2008. The fruit production per tree was 42% and 27% higher in 2007 compared to 2006 and 2008. Concentration of pollen grains (both on jelly‐coated microscopic slides and stigmas) were highest between noon and 2 pm. At this time, the stigmatic pollen load ranged between 4–8 pollen grains per stigma, which is sufficient for fruit development. The study concludes that the asynchronization of the flower opening might give rise to a high amount of self‐pollination in the stand, ultimately leading to poor fruit setting. Also, the large production of flowers and pollen per tree induced geitonogamy and decreased female fitness, as T. grandis is preferentially an out‐crossing species.

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“…BILA et al (1999) reported 80 % of trees to be flowering in a 65-year old teak plantation in Mozambique. Fertility in 40 to 45 year old teak stands is also generally high in south India ranging from 58 to 97 % (VARGHESE et al, 2008). The flowering behaviour of clones originating from the same location was different in the two orchards.…”

Section: Flowering and Fruiting In Orchardsmentioning

confidence: 98%

Annual Fertility Variation in Clonal Seed Orchards of Teak (Tectona grandis L.f.) and its Impact on Seed Crop

et al. 2009

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Fertility variation was studied in two clonal seed orchards (CSO) of teak in four consecutive years (2003-2006). Both orchards were raised in 1976 with grafts of phenotypes selected for growth and form. The seed orchards of CSO I (Topslip, Tamil Nadu State) and CSO II (Walayar, Kerala State) have 15 and 20 clones, respectively, with 13 common clones. The proportion of flowering ramets was generally low ranging from 16 to 53% across years. The best fruit yield during the study period was around 18 kg ha-1 in CSO I and 17 kg ha-1 in CSO II. Highly significant clonal variation and clone by year and clone by site interactions were observed for fertility traits. The clonal contribution was more skewed in poor flowering years than in abundant flowering years and in CSO II than in CSO I. Broad sense heritability for flower and fruit production per tree was low to moderate (0.16 to 0.55). Flower and fruit production by individual ramets in successive years were positively correlated. Correlations between reproductive and growth traits were generally low, but correlation was strong between flowering and fruiting. Fertility variation and group coancestry were higher in poor flowering years than in abundant years and in CSO II than CSO I. Restricting seed collection to abundant flowering years, adjusting ramet number to balance contribution of clones and mixing of seeds from successive years are suggested to reduce relatedness among orchard progeny. The usefulness of low input breeding options for teak like seed production areas are also discussed.

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Fertility variation and its impact on seed crops in seed production areas and a natural stand of teak in southern India

Cited by 11 publications

References 9 publications

Fertility variation among individuals in natural stands of Acacia leucophloea

Fertility variation among individuals in natural stands of Acacia leucophloea

Annual variation in floral phenology and pollen production in a 25‐year‐old plantation of Tectona grandis

Annual Fertility Variation in Clonal Seed Orchards of Teak (Tectona grandis L.f.) and its Impact on Seed Crop

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