INFLUENCE OF 'COLÍN V-33' INTERSTOCK ON SOME PHYSIOLOGICAL ASPECTS IN AVOCADO (Persea Americana MilI.)

To study the effect on some physiological aspects of 'Colín V-33' as interstock the following treatments used: 'Colín V-33'/ Mexican Race, 'Hass'/ 'Colín V-33'/ Mexican Race, and 'Hass'/ Mexican Race, in two phenologycal phases: 1) the end of flowering, fruitset and beginning of vegetative growth, and 2) when plants had growing fruits (2.5 months before harvest).The photosintetically active radiation was larger than 1000 J.lmol.m'2's'1; the temperature near to the leaf varied from 22.8 to 32.1 .C in phase 1 and from 22.8 to 27.5 .C in fase 2. The effect of 'Colín V-33' was not different for assimilation rate of CO2 from the control (4.14 and 4.28 J.lmol'm,2's.1, respectively). These two, however, produced effects which were statstically different relative to those from 'Colin V-33'/ Mexican Race for these two variables (6.94 J.lmol'm.2's,1 and 103.2 mmol:m,2.s' respectivelly). The water potential from the treatment with interstock 'Colín V-33' was -14.85 bars while without interstock was -12 bars. The difference was not statiscally significant (P~ 0.05). Within treatments, means for the relationship ABA:AIA (mg.g.1 fresh weight) were always statistically significant (P s 0.05). In 'Colín V-33'/ Mexican Race it was found 28.7 mg in the cultivar an 22.7 mg in the rootstock; in the same order it was fuond 13.9 and 24.2 mg for 'Hass'/ Mexican Race and 32.2, 30, and 23.9 mg in.