Basic leucine zipper protein refers to a grand transcriptional factor family of all eukaryotes that is involved in various developmental and stress responses like flower development, plant height, maturation of seeds, biotic and abiotic stress signaling. About 127 bZIPs in Arabidopsis, 70 in cotton (Gossypium hirsutum), 266 in soybean (Glycine max), 47 in tobacco (Nicotiana tabacum), 70 in tomato (Solanum lycopersicum), 140 in rice, 102 in wheat and 218 in maize have been discovered. In this review, the classification of bZIP is according to the binding specificities of bZIPs as well as their role in transcription.
Triple pistil (TP) wheat is a novel genetic resource which holds the ability to produce three grains in a single floret. In this research, TP wheat derived two F2 populations were studied to investigate genetic variability, heritability, genetic advance, genetic correlation, inheritance pattern and potential of TP trait for grain yield improvement. Phenological data were recorded for 12 morpho-agronomic traits. Most of the traits exhibited significant genetic variability (P ? 0.05) for further trait improvement. Strong positive genetic correlations (r ? 0.99 at P ? 0.01) were computed within yield contributing and yield limiting traits, indicating common genes controlling these traits and opportunity for simultaneous improvement. Inheritance analysis indicated double dominant (15:1) and double recessive (9:7) epistatic ratios in investigated populations, proposing that TP trait was controlled by two nuclear epistatic genes. In conclusion, TP wheat is a valuable germplasm resource for grain yield improvement and floral development studies.
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