Ribulose-1,5-bisphosphate carboxylase/oxygenase content and degradation in diploid, tetraploid, and hexaploid wheat species during monocarpic senescence

Title:

Ribulose-1,5-bisphosphate carboxylase/oxygenase content and degradation in diploid, tetraploid, and hexaploid wheat species during monocarpic senescence

Creator:

Srivalli, B. and Khanna-Chopra, R.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:e6c2ec16-da94-40ec-884f-405410d8b408
uuid:e6c2ec16-da94-40ec-884f-405410d8b408
issn:0300-3604
doi:10.1023/B:PHOT.0000046158.60446.07

Subject:

chlorophyll, endopeptidase, endoproteolytic activity, flag leaf, grain, leaf area, net photosynthetic rate, ploidy, and protein

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Wheat provides a unique genetic system in which variable sink size is available across the ploidies. We characterized monocarpic senescence in diploid, tetraploid, and hexaploid wheat species in flag leaf from anthesis up to full grain maturity at regular intervals. Triticum tauschii Acc. cv. EC-331751 showed the fastest rate of senescence among the species studied and the rate of loss per day was highest in terms of photosynthesis rate, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) content, and flag leaf N content coupled with a higher rate of gain in grain N content. Cultivars Kundan and HD 4530 maintained high flag leaf N content throughout grain filling as compared to the diploids and showed a slower rate of senescence. RuBPCO content was higher in the diploids as compared to Kundan and HD 4530 at anthesis. However, the rate of decline in RuBPCO content per day was also higher in the diploids. This degradation in RuBPCO was mediated by high endoproteolytic activities in the diploids which in turn supported its higher rate of N mobilization as compared to the tetraploid and hexaploid wheat. Acidic endopeptidases were responsible for the mobilization of flag leaf nitrogen in wheat across ploidy levels (r=-0.582, p<0.01). and B. Srivalli, R. Khanna-Chopra.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

393-398

Source:

Photosynthetica | 2004 Volume:42 | Number:3

Harvested from:

CDK

Metadata only:

false