Details

Autor(en) / Beteiligte

• Ceccarelli, M
• Santantonio, E
• Marmottini, F
• Amzallag, G.N
• Cionini, P.G

Titel

Chromosome endoreduplication as a factor of salt adaptation in Sorghum bicolor

Ist Teil von

• Protoplasma, 2006-05, Vol.227 (2-4), p.113-118

Ort / Verlag

Austria: Springer Nature B.V

Erscheinungsjahr

2006

Quelle

MEDLINE

Beschreibungen/Notizen

• Nuclear DNA amounts were measured by Feulgen cytophotometry in Sorghum bicolor cv. 610 plants early exposed to 150 mM NaCl, a treatment known to induce an increased tolerance to salinity in plants carrying this genotype. In salt-treated plants, the percentages of 8C, 16C, and 32C nuclei in roots in the primary state of growth were 21.9%, 13.3%, and 4.3%, respectively. By contrast, in nonsalinized plants, only 3.5% of the nuclei had an 8C content and no higher DNA contents were observed. The salt treatment induced chromosome endoreduplication during the differentiation of cells in the root cortex, where 41.2% of the cells displayed a DNA content higher than 4C (versus 1.3% in control plants). No enhancement of endopolyploidy was observed in cells of the root vascular cylinder or the leaves of the salt-treated plants. In another S. bicolor genotype (DK 34-Alabama), noncompetent for salt adaptation, the same NaCl treatment did not induce chromosome endoreduplication in root cortex cells. Endopolyploidy may be considered as a part of the adaptive response of S. bicolor competent genotypes to salinity.