| Summary: | 碩士 === 國立臺灣大學 === 園藝學系研究所 === 85 === Summary
In litchi, loquat and sweet orange seedlings, secondary roots appeared
on 4, 10 and 11 days after pruning of their primary roots, respectively.
In root pruned cherimoya, litchi, loquat and sweet orange seedlings, the
percentages of the dry weight of roots increased 11.4, 17.2, 21.0 and
46.5% when compared to their controls. The total root length increased as
well.
In the initial stage, the growth of the seedlings had been retarded, as
shown in height of plants and number of leaves, due to the pruning.
However, the retardaton was eliminated after the regeneration of roots.
The primary roots of litchi at different length (0.5~3.0cm) were pruned
back to 0.2cm. Among these, the pruning of 2.0~3.0cm roots resulted in
best growth of top and root parts.
The repeated pruning (2 times) resulted in horizontal distribution of
roots in both litchi and longan seedlins. 2-time pruning of litchi seedlings
resulted in longer total root length and more root number, 10 months after
pruning. On the contrary, 1-time pruning in longan seedlings resulted in
more root number and better plant growth 9 month after pruning.
Pruning of both sides of the row of 2-year-old oriental pear(Pyrus
serotina) planted in the orchard inhibited the bud burst and young leaf
development in autumn, but would accelerated those in spring time. It
resulted in shorter shoots and more young(non-suberization) roots. The
girdling of young longan roots made by the holes in the containers resulted
in swollen roots, which contained high amount of soluble carbohydrate (2
times to control) and starch (40.78% more to non-girdled roots).
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