|Pak. J. Bot., 41(4): 1593-1602, 2009.||Back to Contents|
ALTITUDINAL VARIATION IN THE CONTENT OF PROTEIN, PROLINE, SUGAR AND ABSCISIC ACID (ABA) IN THE ALPINE HERBS FROM HUNZA VALLEY, PAKISTAN
ASGHARI BANO1*, ABDUL REHMAN1 AND MATTHIAS WINIGER2
Abstract: Leaves of four herbaceous alpine plant species were collected during
summer, 2002 from two different altitudes viz., 3,000–3,500 m a.s.l.
from the east-facing slope of Ultar pasture of Hunza valley, Pakistan to
determine the protein, proline, sugar and abscisic acid (ABA) contents
of leaves. The average maximum temperature recorded during the months of
July and August varied from 22ºC to 24ºC and minimum temperatures varied
between 11ºC to 13ºC, whereas average maximum humidity varied from
39-35% and minimum varied from 19 to 21% respectively. Soils of Ultar
are acidic. At the altitude of 3,000 m a.s.l.
Galium aparine L. showed the maximum endogenous ABA; Onobrychis
dealbata Stocks., showed the highest sugar and protein content,
whereas Polygonum alpinum All., exhibited maximum proline. All
the plant species showed a general trend for increased accumulation of
protein, sugar, proline and free endogenous ABA in leaves at high
altitude. The extent of increase appears to be determined by the basal
level of the above mentioned biochemical contents and is necessary for
survival of that species at high altitude.
1Department of Plant Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
2Institute of Geography, University of Bonn, Germany
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