Abstract
In order to find out the basic information for salt tolerance in vice (Oryza sativa L.), effects of NaCl treatment on absorption of inorganic components and growth were investigated in 6 japonica and 5 tongil varieties and compared to the salt tolerance variety, Annapurna. The absorption of N and $\textrm{P}_2\textrm{O}_5$ was less repressed than that of $\textrm{K}_2\textrm{O}$, MgO, CaO, and $\textrm{Si}\textrm{O}_2$ which were a little affected by NaCl treatment. $\textrm{K}_2\textrm{O}$ was the most highly repressed component in the absorption of inorganic components, followed by MgO, CaO, total-N, $\textrm{P}_2\textrm{O}_5$ and $\textrm{Si}\textrm{O}_2$. $\textrm{Na}_2\textrm{O}$ content was increased about twenty times to the control at 30days after NaCl treatment, and tonsil varieties more than absorbed japonica ones. Dry weight of japonica varieties by NaCl treatment was less reduced than that of tonsil varieties, followed by Seomjinbyeo, Sinseonchalbyeo, Nakdongbyeo, Daechoungbyeo, Dongjinbyeo and Chuchoungbyeo in japonica group, and Milyang30, Gayeabyeo, Jangseongbyeo, Chilseongbyeo and Taebackbyeo in tonsil group. The relationship between dry weight reduction and Na/K ratio showed positively significant correlation in rice.
벼 내염성 품종육성의 기초자료를 얻기 위하여, 자포니카와 통일형 품종간에 염처리에 따른 초장, 건물중 및 무기성분 흡수의 경시적 변화를 조사한 결과는 다음과 같다. 1. 수경액에 NaCl을 첨가하여 시용한 결과 N과 $\textrm{P}_2\textrm{O}_5$은 흡수저해는 적었으나, 다른 무기염류의 흡수억제는 $\textrm{K}_2\textrm{O}$＞MgO＞CaO＞Tolal-N＞$\textrm{P}_2\textrm{O}_5$＞> $\textrm{Si}\textrm{O}_2$순으로 컷으며, $\textrm{Si}\textrm{O}_2$는 염수조건 에서도 흡수에 큰 영향이 없었다. 2. $\textrm{Na}_2\textrm{O}$함량은 염처리 초기에는 함유량은 적지만 무처리 대비 흡수율이 급증하여 처리 10일에는 10배. 20일에는 16배 그리고 처리30일에는 20배 정도로 증가하고 자포니카 품종보다는 통일형 품종에서 흡수율이 높았다. 3. 염수처리에 따른 건물중 감소율은 자포니카 품종들이 통일형 품종들 보다 적었고, 자포니카 품종에서는 섬진벼＞신선찰벼＞낙동벼＞대청벼＞동진벼＞추청벼 순으로, 통일형 품종에서는 밀양30호＞가야벼＞장성벼＞칠성벼＞태백벼 순이었다. 4. 염처리에 의한 품종간 K/Na 비와 건물중 감소율과는 부의 상관을 보였다.
