National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Guava (Psidium guajava L.) is an important fruit crop whose growth, flowering, fruit setting and fruit development are strongly influenced by water availability. Moisture deficit can disturb plant water status, stomatal behavior, canopy temperature, chlorophyll stability, photosynthesis and antioxidant balance, resulting in reduced physiological performance during sensitive developmental stages. Guava phenology provides a useful framework for identifying these stage-specific responses and for improving the timing of crop-management practices. This review summarizes the major phenological stages of guava and discusses their relationship with moisture-deficit stress and foliar bioregulation. Particular attention is given to three important developmental windows: early bud development, flower-bud appearance or reproductive transition and the petal fall–fruit-set transition. The potential roles of salicylic acid, melatonin and glutathione in supporting stress tolerance through signaling, osmotic adjustment, antioxidant defense and protection of photosynthetic processes are also discussed. The review highlights that foliar interventions based on actual phenological stages may be more biologically meaningful than application based only on fixed calendar date days. However, further field validation is required to identify suitable bioregulator, dose and phenological-stage combinations under different cultivars, seasons and moisture conditions. Phenology-guided foliar management may provide a useful framework for investigating abiotic stress tolerance, water-use efficiency and sustainable guava production.
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