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Copyright of Genetika (0534-0012) is the property of Serbian Genetics Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Genetika (0534-0012) is the property of Serbian Genetics Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Genetika (0534-0012) is the property of Serbian Genetics Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Genetika (0534-0012) is the property of Serbian Genetics Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Genetika (0534-0012) is the property of Serbian Genetics Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

There is a question related to the use of ultra hybrids: Is it sufficient to introduce just one CTM (cycloxydim tolerant maize) allele (originating from either the male or the female component) into a hybrid? Or is it necessary to introduce both alleles (both male and female component of a given hybrid have this allele) in order to achieve a needed degree of protection against weeds by the application of the Focus Ultra herbicide? There are no available literature data on this topic. We have contacted our colleagues from Novi Sad and found out that it was their opinion that alleles from both components were necessary. On the other hand, our colleagues from the BASF company had a quite opposite opinion. In order to solve this dilemma, we performed a study and hoped that we would get the answer regarding the effects of different doses of the Focus Ultra product on grain yield of a single cross maize hybrid with different number of CTM alleles. Considering the obtained results, it can be concluded that maize resistance to the Focus Ultra can be achieved by the introduction of only one CTM allele (heterozygote) into a single cross maize hybrid. From the selection aspect, this is favourable circumstance for the introduction of new inbreds into maize hybrids for a DUO protection system. At that, one component already has a CTM homozygous allele, while the other component is crossed to it in order to develop an Ultra hybrid. Based on achieved results, it is observable that a very moderate positive female effect was pronounced in the inheritance of maize tolerance to the active ingredient cycloxydim. This means that it is better if the female component has a CTM homozygous allele. [ABSTRACT FROM AUTHOR]

The objective of this research was to test the hypothesis of the existence of an active boron (B) uptake into the cortical cells induced by low B supply. The uptake of B was characterised in two tomato (Lycopersicon esculentum Mill.) genotypes: B-efficient FER and B-inefficient mutant T3238. In addition, pea (Pisum sativum L.) was used as an anatomically appropriate model for obtaining intact root cortex. Time course uptake studies in tomato indicate that the B-inefficient mutant was defective by the absence of an active low-B-induced uptake system in the cortex. Pea roots showed up to 10-fold higher accumulation of B into the cortex symplast at low (0.5 µm) external B supply in comparison to adequate B (10 µm) supply. Also, low-B-induced uptake of B was strongly inhibited by 2,4-dinitrophenol, indicating a metabolic energy-derived active component of B uptake at low external supply. Uptake of B by the cortical cells of tomato and pea plants appears to be a combination of both passive and active components, with a passive component prevailing at higher external B. An active component of B uptake suppressed by either adequate or high B supply might indicate a downregulation of plasma membrane-associated B transporter(s) in root cortical cells.