Differences in iron stress response and iron uptake in some sorghum varieties
Titel:
Differences in iron stress response and iron uptake in some sorghum varieties
Auteur:
Kannan, Seshadri
Verschenen in:
Journal of plant nutrition
Paginering:
Jaargang 2 (1980) nr. 3 pagina's 347-358
Jaar:
1980
Inhoud:
Six sorghum (Sorghum vulqaris Pers.,) varieties representing male and female lines and hybrids were examined for their response to Fe-stress, and their ability to absorb and transport Fe in the absence and presence of phosphate or CaCO,. It was found that the variety 2077-A (male sterile female line) and the variety CSH-5 (hybrid of 2077-A r CS-3541) showed distinct mechanism to tolerate and recover completely from chlorosis induced by Fe-stress in 10 days. Furthermore, these 2 varieties were able to reduce the pH from 6.4 to 3.8 in about 9 days, and this was increased to about 6.2 in another 6 days, which period corresponded with the onset of chlorosis and subsequent recovery. The variety 2219-A (male-sterile female line) was also able to withstand Fe-stress, although the chlorosis appeared only mild throughout. This variety also reduced pH from 6.4 to 4.5, but only after 14 days in the presence of CaCO3 (8 mg/1), and this time corresponded to the period of complete recovery from chlorosis. There appears to be no correlation between Fe uptake capacity and tolerance to Fe-stress in these varieties. The presence of phosphate or CaCO3 in the absorption medium was found to increase Fe absorption and transport in a few varieties.
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