n vitro pollen quantity, viability and germination tests in quince

Squash seeds yield and quality can be improved by proper population plant spacing and the pollen quantity, which influences the pollination quality and fertilization. Nine experiments were conducted as a factorial combination of three spacing between plants (0.8 x 0.3, 0.8 x 0.6 and 0.8 x 0.9 m), two quantities of pollen (50% of an anther and another entire one) and natural insect pollination. Seed and fruit production parameters, and seed quality were evaluated. A randomized complete block design, five replications, with ten plants per plot was adopted. Larger plant spacing increased the average number of mature fruits and seed yield per plant. Seed yield was directly proportional to the amount of pollen used during pollination. Higher amounts of pollen resulted in higher seed yield per area, but the plant spacing did not affect this characteristic. Manual pollination, using a whole anther, did not differ from natural pollination in relation to seed yield and quality.

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Effectiveness of Invertebrate and Vertebrate Pollinators and the Influence of Pollen Limitation and Inflorescence Position on Follicle Production of Banksia aemula (Family Proteaceae)

Australian Journal of Botany ◽

10.1071/bt97070 ◽

1999 ◽

Vol 47 (4) ◽

pp. 553 ◽

Cited By ~ 4

Author(s):

Elizabeth Dalgleish

Keyword(s):

Pollen Limitation ◽

New South ◽

New South Wales ◽

Follicle Development ◽

South Wales ◽

Pollen Quantity

Follicle development of Banksia aemula (R.Brown 1810) was studied in northern New South Wales, Australia, after exposure of inflorescences to different combinations of pollinator type and pollen quantity. When inflorescences within plants were exposed to all pollinators and provided with additional cross-pollen, follicle development was increased, suggesting that B. aemula was pollen-limited. The addition of cross-pollen did not increase follicle development when inflorescences within plants were exposed to invertebrate pollination only. Nor did exclusion of vertebrates significantly reduce follicle development of plants relative to that of others which were exposed to all pollinators. The vegetation surrounding plants influenced the follicle development of inflorescences, and inflorescences in peripheral positions had more follicles than inflorescences that were internal.

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Effects of Pollen Quantity on Progeny Vigor: Evidence from the Desert Mustard Lesquerella fendleri

Evolution ◽

10.2307/2411219 ◽

1997 ◽

Vol 51 (5) ◽

pp. 1679 ◽

Cited By ~ 15

Author(s):

Randall J. Mitchell

Keyword(s):

Lesquerella Fendleri ◽

Pollen Quantity

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Is the global rise of asthma an early impact of anthropogenic climate change?

Ciência & Saúde Coletiva ◽

10.1590/s1413-81232006000300022 ◽

2006 ◽

Vol 11 (3) ◽

pp. 745-752 ◽

Cited By ~ 9

Author(s):

Paul John Beggs ◽

Hilary Jane Bambrick

Keyword(s):

Climate Change ◽

Carbon Dioxide ◽

Atmospheric Carbon Dioxide ◽

Health Effect ◽

Carbon Dioxide Concentration ◽

Anthropogenic Climate Change ◽

Asthma Incidence ◽

Pollen Quantity ◽

Climate Exposure ◽

Early Health

The increase in asthma incidence, prevalence, and morbidity over recent decades presents a significant challenge to public health. Pollen is an important trigger of some types of asthma, and both pollen quantity and season depend on climatic and meteorological variables. Over the same period as the global rise in asthma, there have been considerable increases in atmospheric carbon dioxide concentration and global average surface temperature. We hypothesize anthropogenic climate change as a plausible contributor to the rise in asthma. Greater concentrations of carbon dioxide and higher temperatures may increase pollen quantity and induce longer pollen seasons. Pollen allergenicity can also increase as a result of these changes in climate. Exposure in early life to a more allergenic environment may also provoke the development of other atopic conditions, such as eczema and allergic rhinitis. Although the etiology of asthma is complex, the recent global rise in asthma could be an early health effect of anthropogenic climate change.

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Pollen Quantity and Viability in 65 Litchi (Litchi chinensis Sonn.) Cultivars

HortScience ◽

10.21273/hortsci12193-17 ◽

2017 ◽

Vol 52 (10) ◽

pp. 1337-1341

Author(s):

Jiefang Wu ◽

Danwen Fu ◽

Jiezhen Chen ◽

Changhe Cai ◽

Qian Yan ◽

...

Keyword(s):

Developmental Stage ◽

Pollen Germination ◽

Germination Rate ◽

Pollen Grains ◽

Flowering Period ◽

Litchi Chinensis ◽

Development Stages ◽

Pollen Quantity ◽

Compatible Pollen

The characteristics of litchi pollen have drawn increasing attention in recent years. Previous studies indicated that there are significant differences in the quantity and viability of litchi pollen grains among different varieties and flowering stages. Moreover, the same variety may show a different quantity of pollen grains and viability in different years. There is still a lack of systematic studies on the change of pollen germination rate and pollen amount in different varieties and at different flowering stages. In this study, the changes in the germination rate of pollen at different development stages were studied. It was primarily revealed that the pollen germination rate already approached its peak upon the filament extends fully, but the anther does not dehisce the developmental stage. In 2009 and 2010, the viability and number of pollen grains per anther were investigated in 65 litchi cultivars, and a difference was observed among cultivars. The pollen germination rate ranged between 20.14% (‘Wuchali’) and 54.69% (‘Donlongmili’). The number of pollen grains per anther ranged between 1555 (‘Zhongshanzhuangyuanhong’) and 7455 (‘Houye’). Sixty-five litchi cultivars were classified into six clusters based on the pollen quantity and germination rate. Most litchi cultivars can produce large amounts of viable and compatible pollen grains during the flowering period. Thus, our results indicate that the pollen amount and germination rate might not be the only factors restricting the successful pollination of litchi.

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