Changes in growth and cell wall extensibility of maize silks following pollination.

Journal of Experimental Botany
Nuwan U Sella Kapu, D J Cosgrove

Abstract

In response to pollination maize silks undergo an accelerated process of senescence which involves an inhibition of elongation. To gain insight into the mechanism underlying this growth response, the relationships among silk elongation kinetics, cell wall biophysical properties, pollen tube growth, and expansin protein abundance were investigated. The inhibition of silk elongation became apparent beyond 12 h after pollination. Pollinated walls were less responsive in assays of extension induced by pollen beta-expansin. Expansin protein abundance and endogenous expansin activity were not considerably reduced after pollination. Silk wall plastic compliance was significantly reduced 6 h post-pollination and beyond, suggesting that the wall undergoes structural modifications leading to its rigidification in response to pollination. The reduction in the plastic compliance occurred locally and progressively, shortly after pollen tubes traversed through a region of silk. Though numerous pollen grains germinated and initiated pollen tubes at the silk tip, the density of pollen tubes gradually declined along the length of the silk and only 1-2 reached the ovary even 24 h after pollination. These results support the notion that pollinati...Continue Reading

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Citations

Jun 4, 2011·Molecular Plant-microbe Interactions : MPMI·Ana CaoRogelio Santiago
Jan 14, 2011·Journal of the Royal Society, Interface·Mariusz Pietruszka
Jan 8, 2014·Phytochemistry·Mehdi TradMessaoud Mars
Sep 13, 2014·Molecular Genetics and Genomics : MGG·Wei ZhangBeijiu Cheng
Feb 19, 2016·Plant Cell Reports·Prince MarowaYingzhen Kong
Mar 11, 2011·Current Opinion in Plant Biology·François TardieuBertrand Muller

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Methods Mentioned

BETA
transgenic
protein assay
fluorescence microscopy

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