Water limitation effect on seed development and germination in Trigonella coerulea (Fabaceae)

Akhalkatsi, Maia; Lösch, R.

doi:10.1016/j.flora.2005.06.001

Cited by 29 publications

(19 citation statements)

References 35 publications

(41 reference statements)

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“…Nectar production and seed production were signiWcantly less in 2001 than 2003 (seed set was not measured in 2002), corresponding to the decreased rainfall in 2001. The eVect of water limitation on nectar production and seed set varies across species (Lee and Bazzaz 1986;Herrera 1991;Campbell and Halama 1993;Akhalkatsi and Losch 2005;Halpern 2005), and several researchers have found that selection through female Wtness is weak to nonexistent when resources are limited (Totland and Eide 1999;Totland 2001;Maad and Alexandersson 2004;Caruso et al 2005), suggesting that abiotic resource availability can inXuence Xoral evolution. Correspondingly, I found no evidence of selection on spur angle through female reproductive success in the dry year (2001) but I did Wnd it in the wet year (2003).…”

Section: Discussionmentioning

confidence: 99%

Selection on spur shape in Impatiens capensis

Young

2008

Oecologia

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Rapid speciation within some plant families has been attributed to the evolution of floral spurs and to the effect of spur length on plant reproductive success. The flowers of Impatiens capensis (jewelweed) possess a long, curved spur in which nectar is produced and stored. Spur length and curvature varies among plants within one population. Here I document that spur shape is variable in natural populations, variation within plants is less than variation among plants, and spur shape is correlated with components of female and male reproductive success. The apparent natural selection is weakly directional in 1 of 2 years, with greatest seed production and pollen removal occurring in flowers with the greatest spur curvature. Bee pollinator visit length is longest at flowers with highly curved spurs, and they leave less nectar in these spurs than in flowers with straighter spurs. Spur angle evolution may be limited, at least in part, by opposing selection by nectar-robbers who prefer to visit flowers with greater spur curvature. Other factors that might contribute to the maintenance of spur angle variation are temporal variation in the strength of selection and potential genetic correlations of spur shape with other traits under selection.

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Section: Discussionmentioning

confidence: 99%

Selection on spur shape in Impatiens capensis

Young

2008

Oecologia

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“…A disponibilidade de recursos pode influenciar na floração, produção de sementes e germinação de algumas espécies, como observado por Akhalkatsi & Lösch (2005) em Trigonella coerulea, cultivada sob ambiente com limitado recurso hídrico.…”

Section: Discussionunclassified

“…As determinações mais utilizadas têm sido o teor de umidade e o peso da matéria seca, comprovados com sementes de Bixa orellana (Amaral et al 1999), Tibouchina granulosa (Lopes et al 2005), Mucuna aterrima (Nakagawa et al 2005) e Trigonella coerulea (Akhalkatsi & Lösch 2005). A coloração e o aspecto morfológico dos frutos são medidas práticas de avaliação (Amaral et al 1999), porém não tão precisas.…”

Section: Introductionunclassified

Época de colheita e capacidade germinativa de sementes de Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae)

2007

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Simão, E., Nakamura, A.T. & Takaki, M. Harvest period and germination capacity of Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae) seeds. Biota Neotrop. Jan/Apr 2007 vol. 7, no. 1 http://www.biotaneotropica.org.br/v7n1/pt/abstract?article+bn01507012007 ISSN 1676-0603.An important step for understanding the dynamic of plant species in their environment is the study of their reproductive feature. Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae) is a characteristic species of Serra do Mar, with potential for recovery of degraded areas and with landscaping purpose. The aim of this study was to investigate the acquisition of germination capacity of seeds and establishment of the best period for fruit harvest by weekly harvests, when morphological and germination capacity features were observed in four stages of development. The T. mutabilis seeds germinated only under white light. Besides the necessity of light for germination, seeds of T. mutabilis did not show another type of dormancy at the end of the ripening, with high germination percentage. The germination rate increases progressively in the function of lose of moisture in the subsequent stages of development, suggesting that the high moisture was the factor that restricted the germination. The best indicator of physiological maturation of seeds is the natural opening of the capsule. The advantage of this parameter is that it can be widely utilized and it is easy to recognize it. Due to the anemochoric dispersion of seeds, we propose that the harvest must be done, with good results, of fruit with 21 days after anthesis, and drying the fruit for capsule opening for seed extraction.Keywords: seed germination, seed maturation, morphology. ResumoSimão, E., Nakamura, A. O estudo dos aspectos reprodutivos é um importante passo para entendermos a dinâmica das espécies em seu ambiente natural. Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae), espécie característica da Serra do Mar, apresenta potencial para recuperação de áreas degradadas e para fins paisagísticos. Objetivou-se investigar a aquisição da capacidade germinativa das sementes e o estabelecimento da melhor época para colheita de frutos da espécie por meio de coletas semanais, onde as características morfológicas e a capacidade germinativa foram observadas, em quatro estádios de desenvolvimento. A capacidade germinativa foi observada com 14 dias pós-antese e a máxima germinação foi observada aos 21 dias. As sementes T. mutabilis germinaram somente na luz. Além da necessidade da luz para a germinação, as mesmas não apresentaram nenhum tipo de dormência na fase final de maturação, apresentando alta porcentagem de germinação, A velocidade de germinação aumentou progressivamente em função do dessecamento das sementes nas subseqüentes fases avaliadas, sugerindo que a alta umidade foi o fator limitante para a germinação. O melhor indicador de maturação fisiológica e de fácil observação, para a espécie, é o início da abertura natural das cápsulas, entretanto, devido às sementes anemocóricas pequ...

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“…3), when S. variegata seeds finally have chance to touch soil surface, it is probable that the viability of the seeds have already dropped to a very low level or even to zero. In addition, many studies have well demonstrated that seed germination needs sufficient and stable water supply434445464748. In Three Gorges reservoir area, rainfall occurs mainly in rainy season from April to August, October to December in this area has low rainfall in a year and usually no rainfall occurs for many successive days (Fig.…”

Section: Discussionmentioning

confidence: 97%

Seed sojourn and fast viability loss constrain seedling production of a prominent riparian protection plant Salix variegata Franch

Ayi

Zeng

Liu

et al. 2016

Sci Rep

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Salix variegata Franch, a prominent plant applied in riparian shelter vegetation in Three Gorges reservoir region of China, produces many seeds every year but generates only a few or no seedlings. Whether the low seedling production of S. variegata is caused by seed sterility or by rapid loss of seed viability remains unknown. We investigated the sojourn time of mature seeds in capsules produced in early, mid, and late reproductive season and the germinability of mature seeds fresh or stored after different period of time. The sojourn time of seeds in capsules was 2.89, 3.95, and 4.72 days in early, mid, and late reproductive season, respectively. The maximal germination percentage of non-stored fresh seeds produced in early, mid, and late reproductive season was 93.33%, 78.67%, and 40%, respectively, which indicates mature seeds were not sterile. The longest viability-retaining time of seeds produced in early, mid, and late reproductive season was only 8, 16, 16 days, respectively, indicating that mature seeds of S. variegata lost viability very rapidly. Mature seeds possessed good viability, but their rapid viability loss caused the low seedling production and hampered the population growth of S. variegata in the riparian area of Three Gorges reservoir region.

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Water limitation effect on seed development and germination in Trigonella coerulea (Fabaceae)

Cited by 29 publications

References 35 publications

Selection on spur shape in Impatiens capensis

Selection on spur shape in Impatiens capensis

Época de colheita e capacidade germinativa de sementes de Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae)

Seed sojourn and fast viability loss constrain seedling production of a prominent riparian protection plant Salix variegata Franch

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