e-journal

Among-species differences in pollen quality and quantity limitation: implications for endemics in biodiverse hotspots

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Background and Aims:
Insufficient pollination is a function of quantity and quality of pollen receipt, and the relative contribution of each to pollen limitation may vary with intrinsic plant traits and extrinsic ecological properties. Community-level studies are essential to evaluate variation across species in quality limitation under common ecological conditions. This study examined whether endemic species are more limited by pollen quantity or quality than non-endemic co-flowering species in three endemic-rich plant communities located in biodiversity hotspots of different continents (Andalusia, California and Yucatan).
Methods:
Natural variations in pollen receipt and pollen tube formation were analysed for 20 insect-pollinated plants. Endemic and non-endemic species that co-floweredwere paired in order to estimate and compare the quantity
and quality components of pre-zygotic pollination success, obtained through piecewise regression analysis of the relationship between pollen grains and pollen tubes of naturally pollinated wilted flowers.
Key Results:
Pollen tubes did not frequently exceed the number of ovules per flower. Only the combination of abundant
and good quality pollen and a lownumberof ovules per flower conferred relief frompre-zygotic pollen limitation in the three stochastic pollination environments studied.Quality of pollen receiptwas found to be as variable as quantity among study species. The relative pollination success of endemic and non-endemic species, and its quantity and quality components, was community dependent.
Conclusions:
Assessing both quality and quantity of pollen receipt is key to determining the ovule fertilization potential
of both endemic and widespread plants in biodiverse hotspot regions. Large natural variation among flowers of
the same species in the two components and pollen tube formation deserves further analysis in order to estimate the environmental, phenotypic and intraindividual sources of variation that may affect how plants evolve to overcome this limitation in different communities worldwide.

Key words: Co-flowering community, Mediterranean, piecewise regression, pollen limitation, pollen tubes,
pollination, stigmatic pollen load, Yucatan.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2013

Deskripsi Fisik

Annals of Botany 112: 1461–1469, 2013

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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