Selective transcriptional down-regulation of anther invertases precedes the failure of pollen development in water-stressed wheat.

Abstract:

:Water deficit during male meiosis in wheat (Triticum aestivum L.) causes pollen sterility. With a view to identifying the internal trigger for this failure, it was found that water stress specifically impairs the activities of vacuolar and cell-wall invertases in anthers prior to the arrest of pollen development. The enzymes are affected only when water deficit occurs around meiosis. Three invertase cDNAs, two encoding the cell-wall (Ivr1, Ivr3) and one the vacuolar (Ivr5) isoform, were isolated from an anther cDNA library. RNA gel-blot analysis using floral organs of well-watered plants revealed that these genes were expressed preferentially, though not exclusively, in anthers. Semi-quantitative RT-PCR demonstrated that transitory water deficit during meiosis selectively down-regulated the transcription of two of the three genes, one encoding the vacuolar (Ivr5) and the other a cell-wall (Ivr1) isoform, without affecting the Ivr3 message. Their expression did not recover upon resumption of watering. Another homologue of Ivr1 was also down-regulated, but only during the post-stress period. The stress effects on invertase transcripts were consistent with those on the developmental profiles of the corresponding enzyme activities. In situ hybridization revealed that the stress-sensitive invertase genes, unlike an insensitive one, were expressed within the microspores. No evidence for an invertase inhibitor under stress was found. Together the results show that the decline in invertase activity is probably regulated primarily at the transcriptional level in a gene- and cell-specific manner.

journal_name

J Exp Bot

authors

Koonjul PK,Minhas JS,Nunes C,Sheoran IS,Saini HS

doi

10.1093/jxb/eri018

keywords:

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

179-90

issue

409

eissn

0022-0957

issn

1460-2431

pii

eri018

journal_volume

56

pub_type

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