Effect of waterlogging on growth citrus rookstock seedlings

• Main Author: 莊文忠
• Other Authors: 陳右人
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/26708919876426097542

碩士 === 國立臺灣大學 === 園藝學研究所 === 92 === Citrus seedlings, which transplanted in 25 cm high pet pod with quartz sand for 2 weeks, were used in this research, to select waterlog tolerant citrus rootstock at a plastic tunnel in National Taiwan University. Six rootstocks, Sunki, Rangpur lime, sour orange, Cleopatra mandarin, ‘Swingle’ citrumelo and ‘Troyer’ citrange, were tested in the first experiment, waterlogged for 4 weeks from Sep, 26 to Oct, 17 2002. Then Sunki, ‘Swingle’ citrumelo and ‘Troyer’ citrange which had showed significant response were selected for the subsequent experiment and were waterlogged for 6 weeks from Mar, 28 2003. In the first experiment, roots of all rootstocks rotted after 1 week of waterlogging. Shoot growth retarded and leaves turned yellow after 3 and 4 weeks respectively. In the condition of high underground water, root rot appeared in all rootstocks during 4-7 days after treatment and adventitious root grew after 2-4 weeks of waterlogging. The plant growth of the plant in the second experiment approximated to those of the first one. Sunki had the most number of fallen leaves and ‘Troyer’ the least. After 6 weeks of waterlogging ‘Swingle’ citrumelo and ‘Troyer’ citrange began to establish new root system above submerged zone and Sunki developed less adventitious roots. The contents of N, K, Ca and Mg in leaves of all waterlogged plants decreased but the content of Fe increased. The contents of P, Zn and Mn did not change significantly. Root had similar consequence with Fe accumulation to 2000-3000 mg/kg. The contents of carbohydrates also increased, especially in 80% EtOH Soluble Sugar. The shoot growth of ‘Swingle’ citrumelo and ‘Troyer’ citrange resumed after 1 week of drainage. The leaves of Sunki fell after 1 week of drainage and new leaves grew 6 weeks later. In terms of growth potential, ‘Swingle’ citrumelo and ‘Troyer’ citrange were more tolerant to waterlogging and recovered more quickly after drainage. However, Sunki was hurt severely after waterlogging and took longer to recover after drainage.