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in Malabing Valley like rampant usage of
fertilizer and pesticide.
Moreover, this was supported by the
data in Repetition index in which the lower the
value observed the higher the count of each
species found in the area. Kongkong Valley
recorded with a value of 0.56 followed by
Muta Valley with a value of 0.69 and 0.63 for
Malabing Valley. Species richness is greatest
at intermediate frequency and/or intensity of
disturbance. This is because very frequent
disturbance eliminates sensitive species,
whereas very infrequent disturbance allows
time for superior competitors to eliminate
species that cannot compete.
In-Vivo Compatibility and Colonization of
VAM Species in Citrus Root System
The portion pointed with the larger
arrow shows the citrus root penetrated and
invaded by arbuscluar mycorrhizal fungi,
Glomus mosseae in satsuma seedlings. The
part pointed with the smaller arrow, labeled MY,
is the mycelia of mycorrhiza. The part labeled
EP is the epidermal cells of the root and the
part labeled C is the cortical cells of the root.
Another penetration of mycorrhizal
fungi, Glomus mosseae, to the cortical cells of
the citrus root was observed.
The citrus root of the control treated
plants. There are no single fungi that penetrated
the root system since the soil wherein the
seedlings were planted was sterilized before
the experimentation.
Results also show that ample
penetration of the mycorrhizal fungi to the
root system of citrus seedlings inoculated with
fungi. This implies that the significant increase
in stem diameter is attributed to the presence
and penetration of the arbuscular mycorrhizal
fungi, particularly Glomus mosseae, to the root
system of the plant.
J.I. Yago, et.al
While the ponkan seedlings are still
under observation, the roots of a seedling
were taken to see and examine the penetration
and colonization of the fungi. The results of
the microscopic observation are shown in the
figures.
The roots of a plant sample treated
with Gigaspora gigantea was observed under
photomicroscope. In the figure, mycelial
penetration of the mycorrhizal fungi on the
epidermal cells of the citrus root is clearly seen.
The portion labeled G shows the germinated
mycelia of mycorrhizae.
The root system of a ponkan seedling
treated with an unknown fungi species
presumed to be of genus Glomus. Knowing
that the roots of the satsuma seedlings were
observed two weeks after inoculation of the
fungi, while the ponkan roots were observed
five days after inoculation, the results of the
percent colonization of the mycorrhizal fungi
shows that there is better penetration of the
fungi in the younger seedlings than that of the
older ones. Thus, arbuscular mycorrhizal fungi,
as bioenhancers to citrus species, act better
in the earlier stages of the development of the
plant than in later periods.
Plant Tissue Nutrients Concentration of
Citrus Seedlings Inoculated with Indigenous
VAM
Citrus seedlings inoculated with
vesicular-arbuscular mycorrhiza, increased
plant tissue nutrients concentration. Table 4
shows plant tissue phosphorus, nitrogen and
potassium concentration was much higher
in the inoculated plants than non inoculated
ones. At yield-maximizing N rates, leaf N
concentrations were 3.35 to 4.50 %; 0.50 to
0.70 % of P and 2.0 to 3.0 % for K which is
generally accepted as critical leaf tissue NPK
concentration range according to (Kallsen,
2003). T he results indicate that tree N status
was adequate at yield-maximizing N rates.
The higher phosphorus concentration
in the inoculated plants could be attributed to a
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