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Tuesday, October 21, 2014

Hydrogen peroxide and thiourea both effect hormone regulation and antioxidant enzymes in microtubers and tubers -- African Crop Science Vol.21 No.3

Today we are featuring African Crop Science vol.21 no.3.

This issue includes "Estimates of Genetic Parameters for Quality of Wheat Cultivars Grown in Lesotho" by Morojele & Labuschagne, which explores different genotypes of wheat grown in Lesotho. The quality of wheat of five parents, F1 and F2 progeny, was examined. Among the characteristics examined were break flour yield, flour protein content, kernel weight, kernel diameter and kernel hardness. Broad heritability was found to be high for all characteristics of F1 and F2 progeny. The results indicated that the characteristic of kernel hardness, particularly in the F1 progeny showed the highest prediction ratio. The study concluded that genetic variability is evident in wheat cultivars and could be used to improve wheat quality in Lesotho.

This issue also includes "Effect of Hydrogen Peroxide and Thiourea on Dormancy Breaking of Microtubers and Field-Grown Tubers of Potato" by Mani et al. This article examines the effects of hydrogen peroxide on potato (Solanum tuberosum) microtubers. Because potato microtubers have a dormant apical bud, they do not necessarily flourish even in appropriate environmental conditions. In this study, hydrogen peroxide is used by applying directly or indirectly thiourea, a catalase inhibitor, to test the dormancy release and sprouting of potato microtubers. The first step of involved looking at the percentage of microtubers that had sprouted that were planted in peat and grown in greenhouses after hydrogen peroxide and thiourea were applied in various dosages. The percentage of sprouted microtubers with time was examined with field-grown microtubers during storage, after hydrogen peroxide and thiourea were applied. The results indicated that 20 mM applications of hydrogen peroxide had a rapid and synchronous sprouting effect on microtubers, while 40 mM and 60 mM applications caused asynchronous sprouting. The results also indicated that thiourea applications of 250 mM increased sprouting of microtubers and was effective at reducing the dormancy period. For field-grown tubers, sprouting was most stimulated 60 mM of hydrogen peroxide was applied to tubers, and 250 mM of thiourea also caused maximum sprouting and better sprouting capacity of tubers. The study concluded that hydrogen peroxide and thiourea both have an effect on hormone regulation and antioxidant enzymes, affecting dormancy in both microtubers and tubers.

For the complete results of these studies and other studies from this issue, click here.

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