Pollen stigma interaction - stigma, Biology

Pollen Stigma Interaction - Stigma

The Stigma After landing on the stigma pollen grain germinates, and produces a pollen tube that carries the male gametes. The stigma has been classified into two principal types depending on the presence or absence of stigmatic exudate at the time of pollination:

  1. The wet stigma is covered by a sticky secretion, e.g., Aegle marmelos and Petunia hybrida, and
  2. The dry stigma lacks any secretion, e.g., cotton.

EM observations indicate that the exudate is secreted by the ER and it is extruded by exocytosis. The diagrammatic representation of the mechanism involved is shown in Figure. In some plants such as Lilium, the stigma is non-secretory. The exudate which is present on stigma is, in fact, secreted by the stigmatic papillae and those present in the stylar canal emanate from the style.

Posted Date: 1/23/2013 3:03:28 AM | Location : United States







Related Discussions:- Pollen stigma interaction - stigma, Assignment Help, Ask Question on Pollen stigma interaction - stigma, Get Answer, Expert's Help, Pollen stigma interaction - stigma Discussions

Write discussion on Pollen stigma interaction - stigma
Your posts are moderated
Related Questions
Q What are the few examples of beings of the phylum Arthropoda that present a high level of behavioral sophistication? Insects like some species of wasps, bees, termites and an

Determine teh term - Magnesium  Magnesium helps in translocation of carbohydrates and regulates the uptake of other nutrients, presumably by helping in the formation of phosph

Explain Casein Casein is an important example of protein, which can be boiled without apparent change in stability. The exceptional stability of casein makes it possible to boi

what is vagina explain with diagram

Agroup of realated genera are classified as-?

Organization in non-reduced embryo sacs The fate of a nucleus in the embryo sac depends upon its position. Many irregularities in the disposition of nuclei in the early polar

F i l a r i a s i s Animal filariasis is an important helminthic infection caused by large number of parasites. In bovines, it is caused by setaria, stephanofilaria, p

Define Importance of Family and Patient Education - Food Allergy? Remember, involvement of the family and all other relevant caretakers along with the patient is crucial for pr

what is origin ofspharosome

classification and their characteristicts