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Azeez A.,Plant Molecular Biology Laboratory | Sane A.P.,CSIR - Central Electrochemical Research Institute
Plant Signaling and Behavior | Year: 2015

Plants have to cope with changing seasons and adverse environmental conditions. Being sessile, plants have developed elaborate mechanisms for their survival that allow them to sense and adapt to the environment and reproduce successfully. A major adaptive trait for the survival of trees of temperate and boreal forests is the induction of growth cessation in anticipation of winters. In the last few years enormous progress has been made to elucidate the molecular mechanisms underlying SDs induced growth cessation in model perennial tree hybrid aspen (Populus tremula × P. tremuloides). In this review we discuss the molecular mechanism underlying photoperiodic control of growth cessation and adaptive responses. © 2015 Taylor & Francis Group, LLC.

Chaurasia A.K.,Plant Molecular Biology Laboratory | Patil H.B.,Plant Molecular Biology Laboratory | Azeez A.,Plant Molecular Biology Laboratory | Subramaniam V.R.,Plant Molecular Biology Laboratory | And 3 more authors.
Physiology and Molecular Biology of Plants | Year: 2016

The CONSTANS (CO) family is an important regulator of flowering in photoperiod sensitive plants. But information regarding their role in day neutral plants is limited. We report identification of nine Group I type CONSTANS-like (COL) genes of banana and their characterization for their age dependent, diurnal and tissue-specific expression. Our studies show that the Group I genes are conserved in structure to members in other plants. Expression of these genes shows a distinct circadian regulation with a peak during light period. Developmental stage specific expression reveals high level transcript accumulation of two genes, MaCOL3a and MaCOL3b, well before flowering and until the initiation of flowering. A decrease in their transcript levels after initiation of flowering is followed by an increase in transcription of other members that coincides with the continued development of the inflorescence and fruiting. CO binding cis-elements are observed in at least three FT-like genes in banana suggesting possible CO-FT interactions that might regulate flowering. Distinct tissue specific expression patterns are observed for different family members in mature leaves, apical inflorescence, bracts, fruit skin and fruit pulp suggesting possible roles other than flowering. This is the first exhaustive study of the COL genes belonging to Group I of banana. © 2016 Prof. H.S. Srivastava Foundation for Science and Society

Juturu V.N.,Plant Molecular Biology Laboratory | Mekala G.K.,Plant Molecular Biology Laboratory | Kirti P.B.,University of Hyderabad
Plant Cell, Tissue and Organ Culture | Year: 2015

Cotton (Gossypium spp.) is an economically very important fiber yielding crop, which is grown almost in sixty-five countries throughout the world. Like other crops, cotton also suffers from major biotic and abiotic stresses. In fact, the losses due to insect pests in cotton are enormous compared to other crops, thereby reducing the actual economic potential. It is a well-known fact that more than half of the total pesticide consumption across the world is utilized on controlling insect pests in this crop. Though conventional breeding and integrated pest management practices have resulted in improving/developing fiber quality, heat tolerance, CMS lines and yield, much success has not been reported with respect to biotic and abiotic stresses, especially insect pests due to the non-availability of genes conferring resistance within a crossable gene pool. Thus, genetic engineering has become an inevitable tool in finding solutions to these problems and transfer of alien genes into commercially important cotton varieties in the last two decades. In fact ~81 % of cotton grown throughout the world is genetically modified. Despite these achievements, several limitations still exist in achieving cotton transformation. In this review, we discuss the status of different regeneration and transformation methods in cotton along with the major factors that exert influence in developing cotton transgenics, besides the chronological progress made in tissue culture and cotton transformation technology. © 2014, Springer Science+Business Media Dordrecht.

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