Self-incompatibility systems

In classical genetic self-incompatability systems, the site of pollen tube inhibition is on the stigma surface or somewhere in the style. A pollen grain may fail to genninate, or produces a tube that grows abnonnally and is soon occluded by callose, or... 

Variations of the life cycle occur. For example, a process called apomixis leads to asexual formation of seed.469 In many plants, including maize, separate flowers form the ovule and the pollen. This is one mechanism for avoiding inbreeding.470 In many plants systems of self-incompatibility have evolved.471 In some, e.g., Arabidopsis and other crucifers, pollen germination is disrupted unless it falls on a stigma possessing a different allele-specific receptor. In other cases development of the pollen tube is disrupted at a later stage. In maize and in more than 150 other... 

S locus cysteine-rich protein self-incompatibility S locus glycoprotein S locus receptor-like kinase systemic wound response protein... 

PLC and PES were found to be incompatible and formed a self-reinforced system. The chain orientation of the PLC component was constant in the melt flow direction (Hermans orientation function, defined by equation 8.6, s = 0.39 + 0.03) in these blends. The aL parallel to the melt flow direction was always lower than that in the lateral direction. Values of ay of PES + PLC blends decreased markedly in an almost linear manner with increasing PLC content. There is moderate increase in aj. A comparison with the Takayanaga model [101] gives the best fit value for b — 0.50. A slight deviation between predicted and experimental values was obtained for the blends with 60 to 80% PLC, showing a higher b value due to the greater reinforcement. 

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