Screening tomato (Lycopericon esculentum Mill) And Eggplant (Solanum melongena Linn) rootstocks for Tolerance to anoxia

• Main Authors: Deng-lin Wu, 吳登琳
• Other Authors: Yung-Fu Yen Ph.D.
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/42116827093576530616

碩士 === 國立嘉義大學 === 農學研究所 === 93 === Ten tomato (Lycopersicon esculentum Mill.) and ten eggplant (Solanum melongena L.) accessions were selected to evaluate the physiology of anoxia tolerance using a non-circulating hydroponics system in a greenhouse during winter and summer seasons of 2002 and 2003. These accessions were also evaluated for their flooding tolerance in open-field conditions in the summer of 2003 at the AVRDC in Shanhua, Taiwan. Nitrogen was used to create anoxic conditions in the non-circulating hydroponics system. Sap flow was reduced and wilting symptoms intensified as anoxia continued. Anoxia severely inhibited biomass production and leaf area expansion; and increased root leakage and calcium and potassium contents in sap. The potassium to calcium ratio in sap 2 h after stem decapitation was 38:1 in both tomato and eggplant rootstocks. Higher levels of potassium were found in sap of tomato rootstocks that were resistant to anoxia. The leaf water potential of both tomato and eggplant rootstocks were similar prior to anoxia. But 24 h after anoxia, the leaf water potential in tomato declined to –1.52 MPa, while eggplants experienced no change until 120 h of anoxia; at 168 h, their leaf water potentials declined to –1.25 MPa. In greenhouse conditions, there were no differences in the performance among tomato rootstocks after 24 h flooding, but eggplant accessions EG 048, EG 203, TS 98 and PINTUNG rootstocks were superior compared to other eggplant accessions after 168 h flooding. In open-field conditions, tomato grafted onto their own or other tomato rootstocks survived only 24 h after flooding; in contrast, TLCV 15 F1 scions grafted onto eggplant rootstocks (EG 195, EG 203 and PUSA-long) survived over 168 h of flooding. Based on the physiological and morphological criteria, it was found that tomato accessions L 123 and L 150 and eggplant accessions EG 195, EG 203 and PUSA-long showed greatest promise for use as rootstocks to counteract anoxia. Tomatoes grafted onto eggplant rootstocks were characteristically highly tolerant to flooding, outyielding tomatoes grafted onto tomato rootstocks by a factor of 100.