e-book
Breeding Plantation Tree Crops:Temperate Species
Tree species are indispensably supportive to human life. Due to their long life
cycle and environmental sensitivity, breeding trees to suit day-to-day human
needs is a formidable challenge. Whether they are edible as apple, cocoa,
mango, citrus, litchi, pear, dates, and coconut or industrially essential as
rubber or beverages like coffee and tea, improving yield under optimal,
suboptimal, and marginal areas calls for a unified effort from scientists
around the world. While the uniqueness of coconut as ‘kalpavriksha’
(Sanskrit-meaning tree of life) makes its presence in every continent from Far
East to South America, tree crops like cocoa, oil palm, rubber, apple, peach,
grapes, and walnut prove their environmental sensitivity toward tropical,
subtropical, and temperate climates. Desert climate is quintessential for date
palm. Thus, from soft drinks to breweries to beverages to oil to tyres, the value
addition offers a spectrum of products to human kind, enriched with
nutritional, environmental, financial, social, and trade-related attributes.
Taxonomically, tree crops never confine to few families, but spread over a
cross-section of genera, an attribute so unique that contributes immensely to
biodiversity even while cultivated on commercial scale. Many of these species
encourage other flora to nurture in their vicinity, thus ensuring their integrity
toward preserving biodiversity. While wheat, rice, maize, barley, soybean,
cassava, and banana make up the major food staples, many fruit-yielding tree
species contribute toward nutritional enrichment in human life. The edible part
of these species is the source of several nutrients that make additives for the
daily human diet, for example, vitamins, sugars, aromas, and flavor
compounds, and raw material for food-processing industries. Tree crops face
an array of agronomic and horticultural problems in terms of propagation,
yield, appearance, quality, diseases and pest control, abiotic stresses, and poor
shelf life.
Shrinkage of cultivable land and growing demand has enforced these crops
to be grown under marginal conditions that call for concerted efforts from
breeders to improve these crops substantially. Concerted efforts have not been
incurred to bring out the compilation of research done on tree crops grown
under both traditional and nontraditional environments. Even if available, they
are scattered and also lack comprehensive treatment and wholesomeness. The
task of improving yield in tree crops is foremost in the acumen of global
agricultural research, and the advancements made in this arena are immense
both at conventional and molecular means. This two-volume series on Breeding
Plantation Tree Crops dealing both tropical and temperate species separately is
a sincere effort toward compiling the research available worldwide and bring
them to the reference of scientists, researchers, teachers, students, policy
makers, and even planters. It is worthwhile to note that in the forthcoming
years, tree crops are to be given much importance on par with annual crops due
to carbon trading and nutritional upgradation of the daily diet.
Since tropical species are more diverse, the first volume on tropical species
contains 16 chapters on fruits and nuts (banana, mango, guava, papaya, grape,
date palm, litchi, avocado, and cashew), oil crops (coconut, oil palm, and olive),
industrial crops (rubber), and beverages (coffee, tea, and cocoa). The second
volume contains temperate fruit species including apple, apricot, almond,
citrus, pear, plum, raspberry, and walnut.
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