ЭлБиб

THE SWELLING OF INOCULATED PEAR BUDS AND IT’S

DYNAMICS IN DIFFERENT GRAFT COMBINATIONS

M.BIukmanis

Dobcle Horticulture Plant Breeding Experimental Station,Latvia

The aim of the studies was to determine the compati bility level of

Uie pear eultivars used as framebuilders in Latvia - ’ Saaremaa

Punane 1Limonka', ’Bergainotte d ’Etc', Malnava pear, J.Petrilas

Nr.49; 71; 97 - with the seedlings of quince Nr. 20487.

It was established that bud swelling in spring for most of the

varieties budded on pear rootstocks did start 2 to 4 days earlier than

on quince rootstocks. It was established that tjicre exists a significant

positive correlation between the biochemical and physiological

processes of 2 - year old budded plants (the content of chlorophyll

’a',carotenoides,total amount of pigments, total nitrogen in the one-

year-old shoots) and the initial stage of swelling of the inoculated

pear

the quince rootstocks this correlation was r=0.72;

r=0.78; r=0.70; r=0.92 for the above mentioned factors.

On the other side,there is a significant negative correlation between

the saccharose content in the 1-gear old shoots of 2-year old budded

trees and the start of inoculated bud swelling: r=-0.67 on quince

rootstocks.

The highest compatibility level with quince rootstocks was

established for the Estonian pear cultivar ’Saareaa Punane’.

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