Evaluation of interspecific hybrid kiwifruit for the adaptability to warming conditions introduced from wild species native to Japan

Research Project

Project/Area Number	26450036
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Horticultural science
Research Institution	Kagawa University
Principal Investigator	KATAOKA Ikuo 香川大学, 農学部, 教授 (60135548)
Research Collaborator	BEPPU Kenji SUIZAWA Katsuhiko FUKUDA Tetsuo MIZUTANI Ryosuke SOGAWA Yuki SUGIMOTO Miho MATSUOKA Maki IKEDA Kouichiro
Project Period (FY)	2014-04-01 – 2017-03-31
Project Status	Completed (Fiscal Year 2016)
Budget Amount *help	¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000) Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000) Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000) Fiscal Year 2014: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords	キウイフルーツ / シマサルナシ / 温暖化 / 環境ストレス / 自生種 / 種間雑種 / 耐暑性 / 光合成 / 品種改良
Outline of Final Research Achievements	Tolerance to the environmental stress of the interspecific hybrids between Shimasarunashi (A.rufa) native to warm regions in Japan and kiwifruit (A. chinensis) was evaluated. Interspecific hybrids showed lower chilling requirement for bud break and the tolerance to high summer temperature showing lower incidence of the leaf burn in the field. Even under the artificial stress conditions of high temperature, drought or water logging, the interspecific hybrids hardly suffered leaf burn and maintained photosynthetic activity at a certain rate. These results suggest that the interspecific hybrid cultivars have the tolerance to wide range of environmental stress derived from A.rufa, and that these hybrid cultivars are applicable to the cultivation in the warm regions and A. rufa is useful materials in the breeding program of kiwifruit adapting to the warming.