Blackgram (Vigna mungo) is more salt tolerant than mungbean (Vigna radiata). This study was initiated to know whether the accumulation pattern of mineral ions in different plant parts plays a significant role in the differences in salt tolerance between the two Vigna species. Different mineral ions, viz. N, Cl, Na, K, Mg and Ca in different organs of two varieties of each of blackgram- Barimash-l (susceptible one) and Barimash-2 (tolerant one), and mungbean-Barimung-3 (tolerant one) and Barimung-4(susceptible one), were analyzed after growing with 0, 50, 75 and 100 mM NaCl solutions. The two crops showed a decreased but similar pattern of total N accumulation under saline conditions. The tolerant variety of both the crops showed a less reduction in total N than the susceptible one. Leaves showed the maximum while stem the minimum N, irrespective of levels of salinity. C l[-10] and N a+ accumulation increased with the increasing salinity levels. Interestingly, similar to a halophyte, the salt tolerant blackgram exhibited conspicuously higher amount of N a+ in the shoot than the salt-susceptible mungbean. However, the tolerant varieties showed less amount of N a+ than the susceptible one, especially in blackgram. Seeds of both Vigna spp. accumulated the minimum amount of N a+ than other plant parts. K+ accumulation decreased by salinity in most of the plant parts, except seeds. Blackgram showed larger reduction in K than mungbean. The Mg++ increased in leaves, petioles and stem by salinity while decreased in the roots, podshells and seeds in both the crops. Salinity increased Ca++ accumulation in all plant-parts except roots of both Vigna spp. Apparently, the leaves of mungbean accumulated higher concentration of Ca++ than blackgram. Varietal differences in the accumulation pattern of K+ , Mg++ and Ca++ were not clear. It was concluded that blackgram, presumably, possesses a similar salt tolerance mechanism to halophyte, and the pattern of accumulation of mineral ions in blackgram and mungbean was not fully ascribed to the differences in salinity tolerance between the two Vigna species.gna species.ies.s.ies.

Dry matter(DM) accumulation in different plant parts of two Vigna spp., blackgram(Vigna mungo) and mungbean(Vigna radiata), was compared at different levels of salinity. Two vaarieties of each of blackgram (Barimash-1 and Barimash-2) and mungbean(Barimung-3 and Barimung-4) were grown with 50, 75 and 100mM NaCl solutions and tap water as a control till maturity. The DM accumulation in all plant parts of the two crops devreased with the increasing salinity levels. The reducation was severe in mungbean compared to blackgram. On an average mungbean produced only 3% grain yield compared to 37% in blackgram at 100mM NaCl. The salinity induced growth reduction was relatively less in Barimash-2 than that in Barimash-1. In mungbean, the relative DM production of Barimung-3 was greater than Barimung-4. The extent of biomass reducation due to salinity in different plant parts was not similar. At maturity the rank of biomass accumulation (at 100 mM NaCl) in different plant parts of blackgram was in decreasing order by seeds pod-1 (97%), branch plant-1 (88%), 1000-grain weight (79%), plant height(72%), pods plant-1 (50%), leaf weight and root mass(both 49%) and stem weight (48%). In mungbean, the rank was in decreasing order by 1000-grain weight (57%), leaf weight (54%), plant height (52%), seeds pod-1 (50%), branch plant-1 (41%), root weight (34%), stem weight (24%) and pods plant-1 (6%). Therefore, salinity reduced grain yield more than straw and roots of the Vignaq spp., and blackgram is relatively more salt-tolerant than mungbean.

생리적 형질인 수온과 염분에 대한 내성을 양적 형질로 개발하기 위하여 은어의 정상 발생 2배체 (2N-cont),극체형 2배체 (meiotic-G2N), 난할형 2배체 (mitotic-G2N) 및 2종류의 clone (clone-11, clone-15)의 부화 자어를 대상으로 유전적 변이성을 조사했다. 수온은 19. 22.5, 25. 그리고 30.로 설정하였고 각 수온구에 0, 15 및 30의 염분구를 조합하여 12개의 실험구를 만들어 조사했다. 평균

To select new germplasm for salinity tolerance from new plant type (NPT) breeding lines, the sixty F4 lines selected from the crosses between Korean cultivars and IRRI's NPT lines were evaluated for salinity tolerance at the seedling stage with salinized culture solution (EC=12 dS/m) in the controlled conditions. Two NTP lines derived from a cross between 'Ilmibyeo' and 'IR66152-AC5-1', 'HR15258-7-1' and 'HR15258-27-1', were found to have good tolerance. The salinity tolerance of the lines was compared to their parents and the sensitive ('IR29') and tolerant ('Pokkali') checks in three salinity levels, no salinity (control) and an EC of 12 and 16 dS/m. Visual salinity score, shoot Na+ and Na-K ratio in two NPT lines was significantly low compared with the parents and IR29. Indicating that salinity tolerance of the lines might be derived from a transgressive segregation. The relative water content of the lines was higher than Pokkali, and the dry weight of shoot and root was proportionally decreased to salinity score and salinizing concentration. The visual salinity scores were significantly correlated with shoot Na concentration, Na-K ratio, relative water content, and reduction of dry weight (P<0.01). Their tolerance was attributed to root and shoot characteristics that led to high shoot water content, thus diluting the toxic effect of salts

This study was conducted to find out a desirable screening condition for the salinity tolerance in germination of rice. Seeds of 33 rice varieties were tested in NaCl solutions with various concentration levels. The germination percentage had a decreasing tendency with increasing NaCl concentration and inhibition concentration of 50% germination was 320mM. Standard deviation of germination percentage was highest (28.6) under 300mM NaCl. There was a highly significant correlation between the 50% germination concentration and the germination percentage at 20th day after seeding in 300mM NaCl. Also in 300mM NaCl, the germination percentage at 20th day after seeding was significantly correlated with the germination percentage at the 6th day after seeding. The salinity tolerance on the basis of germination percentage at 6th day after seeding in 300mM NaCl, was strong in 'Hyangnambyeo', 'Ilmibyeo', 'Kancheogbyeo', and 'Namwonbyeo', while weak in 'Ansanbyeo', 'Odaebyeo', 'Nonganbyeo', 'Dasanbyeo', and 'Namcheonbyeo'.

자포니카 벼 내염성 품종육성을 위한 모본들의 조합능력을 아는 것은 교배친의 선정과 육종효율면에서 대단히 중요하다. 본 연구는 유묘기 내염성 관련형질에 대해 내염성 정도가 다른 9개 품종을 가지고, 이면 교배를 실시하여 모본 및 F1 에 대한 유묘기 내염성 검정을 통하여 조합능력을 평가할 목적으로 수행하였다. 유묘기 내염성 평가형질에 대한 일반조합능력 및 특수조합능력은 친품종간 및 F1 간에 고도로 유의한 차이가 있었으며, 특히 일반조합능력이 특수조합능력보다 크게 나타나서, 여기에는 상가적 유전자작용이 비상가적 유전자작용보다 훨씬 크게 관여하고 있음을 알 수 있었다. 각 모본들에 대한 일반조합능력은 Gaori, Namyang 7 그리고 Agami M1 같은 내염성 품종들이 지상부 건물중 및 뿌리 건물중 감소율에서 모두 다른 친품종들에 비하여 우수하였다

본 연구는 이탈리안라이그래스의 발아기간중에 있어서 내염성에 대한 품종간 변리를 조사하기 위한 적정 온도 및 NaCl의 농도를 구하고자 2배체의 9 품종, 4배체의 11품종 등 20 품종을 온도 25℃ , 20℃ 및 15℃ 인 조건에서 NaCl 농도를 350mM까지 8수준으로 조절하여 발아상태를 조사하였다. 1. 대조구에서의 발아율에 대한 발아 50%감소 염농도(발아 50%감소 염농도)는 15℃ 에서 354mM이 었으며 20℃ 에서 324mM 그리고 25℃ 에서 325mM이었다. 2. 온도조건간에 있어서 품종들의 발아 50%멸소염농도는 서로 유의적인 상관관계가 인정되었는데 20℃ 와 15℃ 사이의 상관관계가 25℃ 와 15℃ 또는 20℃ 사이에서보다 유의성이 높았다. 3. 온도 20℃ 인 조건에서 품종들의 발아 50%감소염농도는 NaCl의 농도가 350mM인 조건에서의 치상 10일후에 품종들의 발아속도와 유의적인 상관관계가 인정되었다. 4. 온도 20℃ 이고 NaCl 농도가 350mM인 조건에서의 치상 10일 후 품종들의 발아속도를 비교하여 품종들의 발아내타성을 분류하여 본 결과 Wase Aoba, Bettina, E. K-11, Tetrone, Lira Sand, Tetra Florum 및 Billiken의 7 품종은 강한 것으로 나타났으며, Tuchi, Wase, Wase Yutaka, Sakura Wase, Magnolia, Limella, Delita의 6품종은 중정도로, 그리고 Atalja, Barmultra, Ajax, Liberta, LM-16, Elving, Wilo의 7 품종은 약한 품종으로 분류되었다.