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| Study on Parameters of Rootstock and Scion About Grafting of Pitaya |
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| DOI：10.16768/j.issn.1004-874X.2020.07.010 |
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| Abstract: |
| 【Objective】This study was made to perfect grafting technique and parameters of rootstock and scion of
pitaya so as to improve grafting survival rate and ensure bud sprouting in time.【Method】‘Hongshuijing No.6’ pitaya was
selected as test material. Rootstocks were cut from ripe or green ripe vine-type shoots with different lengths. Mixed orthogonal
array design （OAD） and OAD were used to observe the effect of rootstock position in vine, grafting method, number of buds
per scion and scion maturity on grafting survival. Multivariate analyses on parameters of rootstock length, mass, ratio of mass
to length, rootstock circumference and scion length were conducted with whether scion sprouted or not and scion sprouted time as the dependent variable respectively.【Result】The grafting survival rates of short ripe and green ripe vines, cut into 2 sections
averagely for rootstocks, were 75.0% and 87.5%, respectively. Long ripe vine, cut into 3 sections averagely for rootstocks, was
unfit to be grafted with one bud scion. The middle section from long green ripe vine was unfit for rootstock. It was estimated that
longer rootstock, rootstock with lower ratio of mass to length and slight maturity, and longer scion might be suitable for grafting.
Scions grafted on shorter, thicker and heavier rootstocks with higher ratio of mass to length and maturity were prone to germinate
later or even unable to germinate.【Conclusion】The basic principle of the grafting of ‘Hongshuijing No. 6’ rootstocks was
preliminarily determined. 1-2 years old vines, preferably green ripe vines, may be used for rootstocks. However, the middle section
of long green ripe vine was unfit for rootstock. Rootstock length was not less than 40 cm. Scions were selected from solid stems
near growing point and cut from up to down for grafting. Scion length was not less than 3 cm with 2 buds at least. Flat grafting was
preferred. The grafting technique proved to be effective and practical after mass grafting was carried out with high survival rate of
81.2%. Therefore, it was advocated to be used for breeding and production of pitaya seedlings. |
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