Studies on the relationships between scion and root for development of citrus rootstocks
Project/Area Number |
10660023
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
園芸・造園学
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Research Institution | Shizuoka University |
Principal Investigator |
IWAGAKI Isao Faculty of Agriculture, Shizuoka University, Professor, 農学部, 教授 (50262796)
|
Project Period (FY) |
1998 – 1999
|
Project Status |
Completed (Fiscal Year 1999)
|
Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥1,600,000 (Direct Cost: ¥1,600,000)
|
Keywords | citrus / rootstock / T-R ratio / carbohydrate / IAA / ABA / ヒリュウ / スイングル / カラタチ |
Research Abstract |
Citrus rootstocks are important for the growth of scion varieties, but it is not clear how they regulate scion vigor. We studied three citrus rootstock cultivars; 'Flying Dragon' (Poncirus trifoliata var. monstrosa) a dwarfing rootstock, 'Swingle' citrumelo (P. trifoliata x Citrus paradisi) a vigorous rootstock, and trifoliate orange (P. trifoliata) as the control. Tender buds from new shoots of 'Eureka' lemon were cleft grafted on etiolated rootstock seedlings. Eighteen month after grafting, the dry matter of each part of the young grafts was measured. Top weight was the greatest on 'Swingle' citrumelo and smallest on 'Flying Dragon', but there was no distinct difference in root growth among the rootstocks. Endogenous indole acetic acid (IAA) and abscisic acid (ABA) were measured in the new shoots and fibrous roots. The IAA level in the new shoots was highest in 'Swingle' citrumelo and lowest in 'Flying Dragon'. The ABA level in the new shoots was highest in 'Flying Dragon' and lowest in 'Swingle' citrumelo. Both the IAA and ABA levels in the fibrous roots were highest in the strains of Poncirus trifoliata and lowest in 'Swingle citrumelo. The vigorous rootstock 'Swingle' citrumelo had the highest T-R and IAA-ABA ratios in the new shoots. Sugar contents in the leaves of the scion cultivars and fibrous roots of the rootstock varieties were positivelty correlated with vegetative growth of the scion cultivars. Vigorous rootstock appears to promote scion growth, and the carbohydrate stored in the tree to strengthen the next season's growth.
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Report
(3 results)
Research Products
(11 results)