Journal Title
Title of Journal: Trees
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Publisher
Springer-Verlag
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Authors: Manoj K Rai Pooja Asthana V S Jaiswal U Jaiswal
Publish Date: 2009/10/06
Volume: 24, Issue: 1, Pages: 1-12
Abstract
Guava Psidium guajava L an important fruit crop of several tropical and subtropical countries is facing several agronomic and horticultural problems such as susceptibility to many pathogens particularly guava wilting caused by Fusarium oxysporium psidii low fruit growth short shelf life of fruits high seed content and stress sensitivity Conventional breeding techniques have limited scope in improvement of guava owing to long juvenile period self incompatibility and heterozygous nature Conventional propagation methods ie cutting grafting or stool layering for improvement of guava already exist but the long juvenile period has made them time consuming and cumbersome Several biotechnological approaches such as genetic transformation may be effective practical solutions for such problems and improvement of guava The improvement of fruit trees through genetic transformation requires an efficient regeneration system During the past 2–3 decades different approaches have been made for in vitro propagation of guava An overview on the in vitro regeneration of guava via organogenesis somatic embryogenesis and synthetic seeds is presented Organogenesis in several different genotypes through various explant selection from mature tree and seedling plants has been achieved Factors affecting somatic embryogenesis in guava have been reviewed Production of synthetic seeds using embryogenic propagules ie somatic embryos and nonembryogenic vegetative propagules ie shoot tips and nodal segments have also been achieved Development of synthetic seed in guava may be applicable for propagation shortterm storage and germplasm exchange and distribution An initial attempt for genetic transformation has also been reported The purpose of this review is to focus upon the current information on in vitro propagation and biotechnological advances made in guavaFinancial assistance provided by Council of Scientific Industrial Research CSIR New Delhi to the authors MKR and PA is gratefully acknowledged Suggestions by the anonymous reviewers for improving the manuscript are also very much appreciated
Keywords:
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- Individual tree genotypes do not explain ectomycorrhizal biodiversity in soil cores of a pure stand of beech ( Fagus sylvatica L.)
- Branching of annual shoots in common walnut ( Juglans regia L.) as affected by bud production and indol-3-acetic acid (IAA) content
- Effect of ectomycorrhizal composition on survival and growth of Pinus thunbergii seedlings varying in resistance to the pine wilt nematode
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- Seed dispersal, germination and early seedling establishment of Populus alba L. under simulated water table declines in different substrates
- Variation in gas exchange and water use efficiency patterns among populations of western redcedar
- Interactive effect of extreme climatic event and pollution load on growth and wood anatomy of spruce
- Fine-root growth, fine root mortality, and leaf morphological change of Populus alba in response to fluctuating water tables
- Reference genes selection for quantitative gene expression studies in Pinus massoniana L.
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- Structural relationships between the epicormic formations on the trunk surface and defects induced in the wood of Quercus petraea
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- Structure and subsequent seasonal changes in the bark of sessile oak ( Quercus petraea )
- Differences in morphology, gas exchange and root hydraulic conductance before planting in Pinus canariensis seedlings growing under different fertilization and light regimes
- Effects of leaf and branch removal on carbon assimilation and stem wood density of Eucalyptus grandis seedlings
- Long-term effect of temperature and precipitation on radial growth in a threatened thermo-Mediterranean tree population
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