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Abstract
The
province of Sindh lies between 23° 40” to 40”’ to 29° 38’N and 66° 40’
to 71° 30’E. This region has sub-tropical climate, having chill units
between 100-550 units and 3700-4500 heat units. Soil is silty-loam,
having pH 7.8 to 8.3.
In
the year 1994-95 the area under guava cultivation in Pakistan was
54,400 hectares, while in Sindh it was 3500 hectares. For the same
year the total production of guava in Pakistan was 420,300 tonnes,
while in Sindh it was 20,700 tonnes.
In
order to meet the food requirement of the growing population, we have
to take help of advance technologies, to develop better cultivars,
produce more fruit per tree, so genetic engineering is used for this
purpose.
Introduction
Its name derived from Haitian
name guayaba. It have two common species called common guava (Psidium
guajava), and cattley guava (Psidium cattleianum). The cherry or
cattley guava is red in colour, fruit is acidic, good for
processing. Genus psidium (X=II) includes about 150 species, belong to
family, Myrtaceae. Its scientific name is Psidium aromaticum, and
its two species pear guava P. pyriferum and apple-guava P. pomiferum,
are important. In Pakistan the common variety of guava is psidium
guajava ,which produce 100-300 fruits/tree. Five species of psidium,
which are economically important are, psidium guinase, P. cattleianum,
P. chinese, P. friedrichsthalia, P. guajava, P. aromaticum. |
