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ISHS Acta Horticulturae 735: I International Guava Symposium

IMPROVEMENT OF GUAVA THROUGH BREEDING

Authors:   S.S. Negi, SHAILENDRA Rajan
Keywords:   cultivar, Irbid, selection, kilt psidium species
Abstract:
Guava is one of the important fruits cultivated in several tropical and subtropical countries of the world. The major problems facing the guava industry are severity of wilt disease, high seed content of diploid commercial varieties and poor yield with small, irregular and misshapen fruits of triploid seedless varieties. The main objectives of guava breeding are to develop high yielding, high quality dwarf varieties with fruits of uniform shape, good size, attractive skin and pulp colour, fewer and soft seeds, resistant to wilt, long storage life, suitable for table and processing purposes and to evolve wilt resistant and dwarfing rootstocks. Selection of superior seedlings has resulted in the development of a number of varieties at various research institutes. Several varieties have been evolved through intervarietal hybridization. Interspecific hybridization between Psidium molle and P. guajava has led to the development of hybrids which are resistant to wilt and are graft compatible with commercial varieties of P. guajava. Seedless varieties of guava have been found to be autotriploids (2n = 33). Crosses made between Seedless triploid and seeded diploid variety Allahabad Safeda produced several aneuploids. Three tetrasomic plants had dwarf growth habit and normal shape and size of fruits with less number of seeds. Aneuploid No. 82, a tetrasomic, has been found to have a strong potentiality of its use as dwarfing rootstock. Biotechniques for in vitro propagation of guava germplasm and rapid multiplication of guava seedlings have been developed. Future line of work has been suggested.
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