Field performance of traditionally propagated vis-a-vis tissue cultured poplar.

摘要

Results of a poplar clonal trial with traditionally propagated (TP) ETPs (entire: trans plants) of five clones viz., G48, WSL22, L31, L49 & S7C15 and tissue culture (TC) origin ETPs of one clone S7C15 are presented. Height and diameter growth monitored both in nursery and field trial for each year recorded lower values for TC poplar when compared with that of TP poplar In nursery, TP G48 clone grew ETPs with maximum average height and diameter, whereas, TC SVC15 ETPs had minimum height and diameter growth Height and diameter mean values were higher for TP S7C15 ETPs compared to TC SVC15 ETPs. In the field trial at harvesting stage, TP L34 produced trees with maximum height and diameter, whereas, TC SVC 15 produced trees with minimum height and diameter. The differences between height and diameter growth in field trial between TC and TP poplar were statistically non significant till 4th and 5th year respectively, these differences, however, became statistically significant thereafter till harvesting of the trees at eight years. Height and diameter values for 8 years TC S7C15 clone were 23.7 m and 20.1 cm respectively which were significantly lower than for height of 30.3 m and diameter of 22.7 cm for TP SVC15. There was gradual increase in the percent reduction in height and diameter growth of TC S7C15 when compared with that of TP S7C15 and the average for all the TP poplar. The final reduction in TC S7C15 was approximately 20% for height and approximately 13% for diameter when compared with TP poplar.