Document Type : Research articles.
Author
Dep. of Agic. Botany, Fac. of Agic. Fayoum, Univ., Egypt
Abstract
A filed experiment was conducted to study effect of foliar spray
with some micronutrients (Fe, Zn, Mn and Cu) at three
concentrations, i.e.,50, 100 and 150 mg/L for each or ascorbic acid at
four concentrations, i.e.,100, 200, 300 and 400 mg/L added alone or
together on vegetative growth, flowering, oil yield and some
chemical constituents of tuberose (Polianthes tuberosa L.) plants
grown on a saline calcareous soil. The obtained data indicated that,
all growth parameters, i.e., leaf length, leaf area, number of
leaves/plant, fresh weight of leaves, dry weight of leaves were
significantly increased as a result of foliar spray with micronutrients
and ascorbic acid as solely or combined treatments. In additions
flowering traits, i.e., flower stalk length, number of florets /spike,
spike length, fresh weight of spike, dry weight of spike and number
of spike per plot exhibited pronounced increase. Moreover, bulb
diameter, fresh weight of bulb, number of new bulblet/plant and
essential oil percentage of florets were also increased. The maximum
increases in the former parameters were resulted from using
micronutrients at the rate of 150 mg/L and ascorbic acid at the rate of
300mg/L alone or combined together. The same rates of micronutrients and ascorbic acid also led to increase the concentrations of
chlorophyll a & b, caroteniods, total carbohydrates, total & reducing
sugars, total indols, total free amino acids, free proline, N, P, K, Fe,
Mn, Zn, Cu and vitamin C in leaves .At the same time, the activity of
oxidative enzymes such as peroxidase, catalase, polyphenol oxidase
and ascorbic acid oxidase were recorded the highest values by
spraying with the same rates of micro-nutrients and ascorbic acid
alone or together. On the other hand, the applied treatments decreased
the concentrations of sodium and free phenols in leaves.
In view of these results, it has been concluded that spraying
tuberose plants with the mixture of micronutrients (Fe, Mn, Zn and
Cu) and ascorbic acid at the rates of 150 and 300mg/L, respectively
could be counteracted the adverse conditions, particularly soil salinity
and consequently producing economic flower and oil yields.
Keywords
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