Effects of growth regulator on micro-cuttage tube seedlings growth of alfalfa
Taked Gannong No.3 (G3),Hetian (HT),Longdong (LD)alfalfa as the experimental material, the paper studied the effects of different kinds and concentration of growth regulator,including indolebutyric acid (IBA),naphthalene acetic acid (NAA),ABT (ABT)on growth of micro-cuttage tube seedlings of alfalfa. The results showed that under 0.2 mg/LNAA treament,tube seedlings of Gannong no.3 alfalfa had the high number of roots (8),maximum root length (17.5 cm),the highest rooting rate (100%),and plant height and leaf number was also significantly higher than that of the control (CK)and other treatment (P <0.05).Under 0.1 mg/LNAAtreatment,the root growth of tube seedlings of Hetian alfalfa was obviously superior to other treatments,the rooting rate was 100%,root number was higher (7)and root length was maximum (29.6 cm), plant height and leaf number was also significantly higher than that of the control (CK)and other treatment s (P <0.05).Under 0.2 mg/LNAA treatment,the root growth of Longdong alfalfa tube seedlings was obviously superior to other treaments,the rooting rate was 100%,the root number was higher (7)and the root length was maximum (10.2 cm),the plant height and leaf number was also significantly higher than that of the control (CK)and other treatments(P <0.05).Therefore,the optimal growth regulator and its concentration for Long-dong and Gannong No.3 alfalfa and Hetian alfalfa in micro-cuttage tube seedlings growth was 0.2 mg/L NAA and 0.1 mg/L NAA,repectively.
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