by Dr. Alejandra Kirlin III
Published 2 years ago
Updated 2 years ago
Changes in temperature can alter the effective period of pollination, which in turn determines the final fruit set and the yield that the variety can obtain (Sanzol & Herrero, 2001). The weather determines many of the pollination parameters of these species, such as the pollen germination percentage.Dec 11, 2019
What are the factors that affect germination of pollen?
The effect of temperature on pollen. germination and pollen tube growth. ... The effect of PH on pollen germination and. pollen tube growth. ... The effect of Sucrose on pollen germination. and pollen tube growth. ... The effect of Boric acid on pollen. germination and pollen tube growth. ... The effect of Calcium on pollen germination.
Why do some pollen fail to germinate?
Pistil has an ability to recognise the right type of pollen and accept it for further germination. The pollen grains, which are of different species are rejected and do not undergo further germination.
What is required for germination of pollen?
Boron is the micronutrient for plants, present in the soil in very small amounts. It is absorbed from the soil in the form of boric acid (H3BO3) and tetraborate anions. Boron is required for pollen germination, seed germination and cell differentiation.
Does temperature affect pollen?
Changes in temperature during spring are an important factor on pollen levels. Warm air and higher temperatures will produce an increase in pollen counts. On the positive side, a sudden drop or even a freeze in temperatures can halt pollen production.
Which nutrient is responsible for pollen germination?
The results of many studies indicate that calcium is a critical element that is strongly related to pollen germination and pollen tube growth.
What stimulates the germination of pollen grain?
On the stigma, the germination of pollen grains begins by absorption of water and nutrients and the pollen grain produces a tiny pollen tube through the style to the ovary. The tube cell enlarges and comes out of the pollen grain through one of the germ pores to form a pollen tube.
Is potassium required for pollen germination?
Potassium is usually present in the sufficient amount in the clay soils where it is firmly bound. It is required in meristematic and differentiating tissues.
What stimulates pollen tube growth?
Ionic elements, such as boron and calcium, that are involved in the metabolism during pollen tube growth, and at different concentrations can stimulate or inhibit it. Naturally occurring polyamines such as spermine also stimulate pollen tube germination and elongation when they are sprayed on the stigma.
What affects the pollen count?
Rain, wind, temperature and sunshine all affect how much pollen will be produced and how much it will be dispersed.
Why does pollen increase with temperature?
Warmer temperatures can shift the growing season earlier and extend it longer, as well as help plants produce more pollen. Higher levels of carbon dioxide can also aid photosynthesis so plants produce more pollen, although more research is needed to understand the future increase.
How does temperature affect pollen tube growth?
It has been observed that an increase in temperature produces both a faster growth of the pollen tube, and an acceleration of the ovule degeneration (Hedhly, Hormaza & Herrero, 2005).
Why do some pollen grains will not germinate in vitro?
The abnormal pollen germination like curling of pollen tubes, shrinkage of pollen tube tips and bending of pollen tube might be reasons of sexual incompatibility of this species. It is observed that the taxa required comparatively low sucrose concentration (5%) for their optimal in vitro pollen germination (54.08%).
Why pollen of the wrong type does not germinate on stigma?
Solution : Pollination does not guarantee the transfer of the right type of pollen (compatible pollen). If the pollen is of the wrong type (incompatible type), then the pistil rejects the pollen by preventing pollen germination on the stigma or pollen tube growth in the style.
Why pollen of 1 species fails to fertilize the stigma of another species?
Interspecific incompatibility refers to the failure of pollen from one species to germinate and/or grow on the stigma of another species (for a review, see Taylor 1996). Intraspecific incompatibility is incompatibility that occurs within a species.
How pollen grain can be prevented from germinating?
In recent decades, incompatibility genes—which prevent pollen from germinating or growing into the stigma of a flower—have been discovered in many angiosperm species. If plants do not have compatible genes, the pollen tube stops growing. Self-incompatibility is controlled by the S (sterility) locus.
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