Gametophytic incompatibility, Biology

Gametophytic Incompatibility

In GSI systems callose deposition is not evident on the stigma but is very conspicuous in the pollen tube. Sometimes the callose deposition occurs even in the germpore, inhibiting pollen germination. In the Poaceae, the rejection reaction is completed within a few minutes after pollination and subsequent rejection or acceptance takes 10 minutes with the exception of Poaceae and Oenothera, the recognition/rejection reaction in GSI system occurs after the pollen tube has grown about two third the length of the style.

Genetically the recognition factor on the male side has been attributed to the male gametophyte; the proteins incorporated during pollen wall development in the intine are involved. Since in GSI systems the rejection reaction is comparatively delayed, is also possible that the synthesis or activation, and release of the recognition substances are also delayed and they occur in the pollen tube. In some species the tubes show reduced level of carbohydrates and starch.

Posted Date: 1/23/2013 5:26:22 AM | Location : United States







Related Discussions:- Gametophytic incompatibility, Assignment Help, Ask Question on Gametophytic incompatibility, Get Answer, Expert's Help, Gametophytic incompatibility Discussions

Write discussion on Gametophytic incompatibility
Your posts are moderated
Related Questions
Determine condensation foam method In the condensation method a pressurized solution is suddenly released  to expand the number of gas bubbles which their ripe through the liqu

Explain the Liver Biopsy Assays? These are used to measure the total vitamin A stores, as well us, the response in levels of vitamin A relative to different dosages of the vita

Q. Explain about eukaryotic organism or Fungi? Fungi are eukaryotic organisms. This means that their DNA-containing chromosomes are enclosed within a nucleus inside their cell

Four Distinct Phases of Demographic Transition Demographic transition takes place in four distinct phases. 1. Re-industrial stage in which harsh living conditions lead to

Question 1 State the basic properties of light. Discuss the special features of ultra-microscopy and phase contrast microscopy Question 2 What are ultrasonic waves.

How cells are studied We learnt about the evolution of the cell and a historical account of the growth of cell biology. In this section, you will study about the various tools

Q. What is the formula of the DPD for withered (shrunken) plant cells and how is that situation possible? Withered plant cells are those that have shrunk due to loss of water b

Circulation: If central pulses (femoral  in infants and  carotid in  children) are not  palpable, begin chest compression without losing any time.  In  young infants, encircle

Electric Charge - Properties of Colloidal Systems Colloidal particles are electrically charged. Some colloidal particles carry a positive charge (+), others a negative charge (

define glycolysis.describe the various steps of glycolysis