廣西地方稻種資源核心種質(zhì)的耐鹽性鑒定評價.doc

1、廣西地方稻種資核心種質(zhì)的耐鹽性鑒定評價打開文本圖片集【摘要】：p ：【目的】篩選耐鹽性強的優(yōu)異栽培稻種質(zhì)資，為鹽堿地的改良提供品種支持，也為耐鹽育種、耐鹽基因的挖掘提供理論依據(jù)。【方法】以419份廣西水稻地方品種核心種質(zhì)為試驗材料，進行芽期和苗期的耐鹽性鑒定評價，芽期鑒定采用1.5 NaCl溶液進行鹽脅迫，以相對鹽害率為耐鹽評級指標；苗期鑒定采用沙培法，用0.5 NaCl溶液進行鹽脅迫，以死葉率作為評級指標，以植株矮化率為參考指標?！窘Y(jié)果】廣西水稻芽期耐鹽性等級為3.77級，芽期耐鹽資主要集中于1級和3級，占參試總數(shù)的62.53；苗期耐鹽性等級為7.15級，大部分資耐鹽主要集中于7級和9級，占

2、參試總數(shù)的75.89。在水稻不同類型耐鹽性比較中，芽期平均耐鹽性秈稻（3.64）高于粳稻（4.28），秈稻變異系數(shù)（69.12）大于粳稻（60.28）；苗期平均耐鹽性秈稻（6.91）高于粳稻（8.03），秈稻變異系數(shù)（30.21）大于粳稻（18.43）；秈稻苗期鑒定株高矮化率（32.73）和變異系數(shù)（50.92）均小于粳稻株高矮化率（37.22）和變異系數(shù)（63.62）；相關(guān)分析p 結(jié)果表明，秈稻（r=0.0667）和粳稻（r=-0.0531）的芽期和苗期耐鹽等級均無顯著相關(guān)（P>0.05）。對不同稻作區(qū)水稻耐鹽性進行比較，廣西桂南稻作區(qū)水稻的平均耐鹽性在芽期（3.48）和苗期（6.97

3、）為4個稻作區(qū)中最高?！窘Y(jié)論】廣西水稻地方品種資芽期耐鹽性強于苗期，秈稻耐鹽性強于粳稻，以芽期1級和苗期1、3級進行耐鹽種質(zhì)篩選，獲得楊村一號等12份優(yōu)異耐鹽種質(zhì)資，可作為耐鹽育種的親本選育及在耐鹽基因挖掘中加以利用?！娟P(guān)鍵詞】：p ： 水稻；地方品種；核心種質(zhì)；耐鹽性；種質(zhì)資；廣西中圖分類號： S511 文獻標志碼：A 文章編號：2095-1191（20_）06-0979-06Salt tolerance evaluation for core collection ofrice landraces in Guang_iAbstract：【Objective】Strong salt tole

4、rant cultivated rice germplasm resources were screened in order to provide varieties for reclamation of saline and alkaline land， and offer reference for salt tolerant variety breeding and salt tolerant genes e_ploration.【Method】Salt tolerance at germination stage and seedling stage of rice were ide

5、ntified using 419 rice core germplasm resources in Guang_i.At germination stage， salt stress was conducted with 1.5 NaCl solution and relative salt injury rate was used as evaluation inde_.At seedling stage， seedlings were cultured in sand and treated with 0.5 NaCl solution， with dead leaf rate as e

6、valuation inde_ and plant dwarfing rate as reference inde_.【Result】In Guang_i， salt tolerance grade at rice germination stage was 3.77， and most rice germplasm resources were classified in grade 1 and 3， accounting for 62.53 of the total.Salt tolerance grade at rice seedling stage was 7.15， and most

7、 rice germplasm resources were classified in grade 7 and 9， which accounted for 75.89.In parison of salt tolerance for different rice landraces， at germination stage， average salt tolerance of indica（3.64） was higher than that of japonica（4.28）， and the coefficient of variation of indica rice（69.12）

8、 was higher than japonica rice（60.28）.At seedling stage， average salt tolerance of indica（6.91） was higher than that of japonica（8.03）， and coefficient of variation of indica（30.21） was higher than that of japonica（18.43）.At seedling stage， plant dwarfing rate（32.73） and coefficient of variation（50.

9、92） of indica was less than those of japonica（plant dwarfing rate 37.22 and coefficient of variation 63.62）.Correlation analysis showed that for both indica（r=0.0667） and japonica（r=0.0531）， salt tolerance grades at germination stage and seeding stage were not significantly correlated（P>0.05）.In

10、terms of salt tolerance in different rice planting regions， the average salt tolerance at germination stage（3.48） and the seedling stage（6.97） in Guang_i southern region were the highest among four rice planting regions.【Conclusion】Salt tolerance at germination stage of Guang_i rice landraces is higher than that at seedling stage.Salt tolerance of indica is stronger than japonica.Twelve salt tolerant rice germplasm resources including Yangcun 1 are selected out of seedlings with grade 1 salt tolerance at germ