Cyclophysis and effect of rejuvenation with continued cottage in Pinus massoniana cutting propagation

Key words: 
• Pinus massoniana /
• propagation by cutting /
• cyclophysis /
• ortet rejuvenation

Abstract: Rooting traits of cuttings from two , four , five , six and eight years old masson pine (Pinus massoniana) ortets in the same provenance were analysed after the cuttings were rooted in full exposure mist bed for three monthes .Except sum of the branch roots and the diameter of the longest root , the cyclophysis was found in time for callusing and rooting , sum of the adventitious roots , length of the longest root , total length of the roots and root rate , especially in eight years old ortet .Root effective index of cuttings from two years old ortets was heighest (0.646) , and that from eight years old ones was the lowest (0.056) .However , variation of cuttings from two and four years old ortets was not notable . Therefore , using the seedlings of the half-sib or full-sib families as the masson pine ortets was proposed . In order to solve the probleme of cyclophysis , cuttings from stecklings and seedlings were compared .As a result , the root rate and root effective index from stecklings were eighty percent and 0.451 respectively , higher than those from seedlings sixty-five percent and 0.195 .And , other root traits of cuttings from stecklings were better than those from seedlings indicated that serial cutting rooting could rejuvenate the masson pine ortets .