Báo cáo khoa học: Cutting propagation of Quercus acutissima clones after rejuvenation through serial grafting

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Cutting propagation of Quercus acutissima clones after rejuvenation through serial grafting...
Nội dung trích xuất từ tài liệu:
Báo cáo khoa học: "Cutting propagation of Quercus acutissima clones after rejuvenation through serial grafting" Cutting propagation of Quercus acutissima clones after rejuvenation through serial grafting HK Moon JS Yi 1 Institute of Forest Genetics, Forestry Administration, Suwon, 441-350; 2 Department of Forestry, College of Forestry, Kangweon National University, Chooncheon, 200-701, Republic of KoreaSummary — Vegetative propagation of 34- to 67-year-old Quercus acutissima trees was success-fully achieved from rooted cuttings. Semi-hardwood ramets which were obtained from the clones es-tablished through grafting twice onto the 2-year-old rootstocks showed 60% rooting (ranging from20% to 100%). After grafting only once, average rooting frequency was 11% (ranging from 0 to 34%)using cuttings dipped in 500 ppm indole-butyric acid (IBA) solution. The rooting medium consisted ofequal volumes of peatmoss and perlite. Cuttings were watered by intermittent mist and grown in thegreenhouse at 25 ± 3 °C for more than 5 weeks. For rooting, there was no significant difference be-tween ortet age but marked differences were observed among the clones. Although most of the root-ed cuttings did not sprout new buds in the current year, they usually produced slowly-growing budsand/or revealed plagiotropic growth at the following year.Quercus acutissima / rejuvenation / serial grafting / semi-hardwood cuttingRésumé — Bouturage de Quercus acutissima après greffage en cascade. La multiplication vé-gétative de Quercus acutissima âgés de 34 et 67 ans a été réalisée avec succès. Deux générationssuccessives de greffage sur des porte-greffes de 2 ans ont permis d’obtenir des boutures semi-ligneuses manifestant un taux d’enracinement de 60% (variation totale de 20% à 100%). Après lapremière génération de greffes le taux d’enracinement n’était que de 11 % (0% à 34%); les bouturesétaient trempées dans de l’acide indolbutyrique 500 ppm, le substrat était constitué d’un mélange enquantités égales de tourbe et de perlite. Les boutures étaient élevées sous mist intermittent dansune serre à 25°C (plus ou moins 3°C) pendant 5 semaines. L’âge de l’ortet n’avait pas d’effet sur lestaux d’enracinement; par contre des variations importantes entre clones ont été observées. Bien quela plupart des boutures n’aient pas débourré durant l’année de l’enracinement, elles produisirent despetites pousses l’année suivante, qui étaient dans certains cas plagiotropiques.Quercus acutissima /rejuvénilisation / greffage en cascade / bouture semi-ligneuseINTRODUCTION MATERIALS AND METHODSIn research and usage, little attention has 1 Experimentbeen paid to hardwoods partly due to theforestry policy which focused on conifers Eight clones of Q acutissima plus trees, 34- toand our habitual ways of thinking. Among 62-years-old, provided the first ramets for serialhardwoods, oaks were considered just for grafting followed by rooted cuttings. Scions, col-usage such as fuel, tool handles, small fur- lected in February 1988, were wrapped in plas-niture, acorns and timber for black forest tic bags containing moist cotton and stored in a refrigerator at 4 °C. Scions having 2 or 3 budsmushroom (Lentinus edodes (Berk) Sing). were grafted onto the 2-year-old rootstocks ofHowever, the consumption of oak timber the same plus trees in March 1988 and main-has gradually increased along with the de- tained in the greenhouse. In July 1988, semi-velopment of wood-processing techniques hardwood cuttings were taken from the shootsand the diversity of wood demands (Lee et of the growing scions. The second grafting (us-al, 1989). ing ramets from the first grafts in 1988) and semi-hardwood cuttings (using ramets from the At the Institute of Forest Genetics in Su- second grafts in 1989) followed by the proce- Oak Improvement Project Korea, anwon, dures of 1988 were carried out in March 1989which aimed at clonal conservation of se- and July of the same year, respectively.lected trees and the development of an ef- Cuttings 10-12 cm in length, with 2 or 3 leavesficient propagation method we ...