土壤学报
土壤學報
토양학보
ACTA PEDOLOGICA SINICA
2010年
1期
145-152
,共8页
李青松%王俪梅%汪德勇%王林权
李青鬆%王儷梅%汪德勇%王林權
리청송%왕려매%왕덕용%왕림권
冬小麦%盐胁迫%动力学%Na~+吸收%Na~+排斥
鼕小麥%鹽脅迫%動力學%Na~+吸收%Na~+排斥
동소맥%염협박%동역학%Na~+흡수%Na~+배척
Winter wheat%Salt stress%Dynamics%Sodium uptake%Sodium exclusion
在水培条件下,以4种不同基因型冬小麦小偃6号、NR9405、陕229和RB6为试验材料,采用浓度梯度法等研究了小麦幼苗的Na~+吸收动力学特征及其与耐盐性的关系.结果表明:冬小麦对Na~+的吸收可分为两个阶段,盐浓度在NaCl 50~80 mmol L~(-1)以下(低盐)时,4种冬小麦的Na~+吸收动力学参数V_(max)和K_m分别为Na~+ 0.50、0.30、0.58、0.55 mg g~(-1)h~(-1)和Na~+ 18.50、3.89、70.90、30.68 mmol L~(-1);在NaCl 50~80 mmol L~(-1)以上(中、高盐)时,4种冬小麦的V_(max)和K_m分别为1.81、1.56、2.11、2.11 mg g~(-1)h~(-1)和Na~+ 107.20、70.29、121.06、102.67 mmol L~(-1).在低盐环境中冬小麦对Na~+的排斥率为90%左右,而在高盐环境中对Na~+的排斥率只有50% ~60%.低盐胁迫下小偃6号和NR9405对Na~+的吸收速率较陕229和RB6高50%,Na~+的排斥率品种间相差不大;在中、高盐胁迫下陕229和RB6对盐分吸收累积速率较小偃6号和NR9405高15%,而后者对Na~+的排斥率较前者高10%.高盐胁迫下高的Na~+吸收速率和低的Na~+排斥效应可能是陕229和RB6不耐盐的重要原因.
在水培條件下,以4種不同基因型鼕小麥小偃6號、NR9405、陝229和RB6為試驗材料,採用濃度梯度法等研究瞭小麥幼苗的Na~+吸收動力學特徵及其與耐鹽性的關繫.結果錶明:鼕小麥對Na~+的吸收可分為兩箇階段,鹽濃度在NaCl 50~80 mmol L~(-1)以下(低鹽)時,4種鼕小麥的Na~+吸收動力學參數V_(max)和K_m分彆為Na~+ 0.50、0.30、0.58、0.55 mg g~(-1)h~(-1)和Na~+ 18.50、3.89、70.90、30.68 mmol L~(-1);在NaCl 50~80 mmol L~(-1)以上(中、高鹽)時,4種鼕小麥的V_(max)和K_m分彆為1.81、1.56、2.11、2.11 mg g~(-1)h~(-1)和Na~+ 107.20、70.29、121.06、102.67 mmol L~(-1).在低鹽環境中鼕小麥對Na~+的排斥率為90%左右,而在高鹽環境中對Na~+的排斥率隻有50% ~60%.低鹽脅迫下小偃6號和NR9405對Na~+的吸收速率較陝229和RB6高50%,Na~+的排斥率品種間相差不大;在中、高鹽脅迫下陝229和RB6對鹽分吸收纍積速率較小偃6號和NR9405高15%,而後者對Na~+的排斥率較前者高10%.高鹽脅迫下高的Na~+吸收速率和低的Na~+排斥效應可能是陝229和RB6不耐鹽的重要原因.
재수배조건하,이4충불동기인형동소맥소언6호、NR9405、협229화RB6위시험재료,채용농도제도법등연구료소맥유묘적Na~+흡수동역학특정급기여내염성적관계.결과표명:동소맥대Na~+적흡수가분위량개계단,염농도재NaCl 50~80 mmol L~(-1)이하(저염)시,4충동소맥적Na~+흡수동역학삼수V_(max)화K_m분별위Na~+ 0.50、0.30、0.58、0.55 mg g~(-1)h~(-1)화Na~+ 18.50、3.89、70.90、30.68 mmol L~(-1);재NaCl 50~80 mmol L~(-1)이상(중、고염)시,4충동소맥적V_(max)화K_m분별위1.81、1.56、2.11、2.11 mg g~(-1)h~(-1)화Na~+ 107.20、70.29、121.06、102.67 mmol L~(-1).재저염배경중동소맥대Na~+적배척솔위90%좌우,이재고염배경중대Na~+적배척솔지유50% ~60%.저염협박하소언6호화NR9405대Na~+적흡수속솔교협229화RB6고50%,Na~+적배척솔품충간상차불대;재중、고염협박하협229화RB6대염분흡수루적속솔교소언6호화NR9405고15%,이후자대Na~+적배척솔교전자고10%.고염협박하고적Na~+흡수속솔화저적Na~+배척효응가능시협229화RB6불내염적중요원인.
Hydroponic experiments were conducted to investigate dynamics of Na uptake and salt tolerance of 4 varieties of winter wheat different in genotype, I.e. Xiaoyan- 6, NR- 9405, Shaan-229 and RB- 6. Results indicate that the sodium absorption dynamics of winter wheat could be divided into two phases. When salt concentration was low ( < NaCl 50~80 mmol L~(-1)), the parameters of Na uptake dynamics, V_(max) was 0.50, 0.30, 0.58 and 0.55Na~+ ,mg g~(-1) h~(-1), and K_m 18.50, 3.89, 70.90 and 30.68 mmol L~(-1) of Xiaoyan- 6, NR- 9405, Shaan-229 and RB- 6, respectively;But when salt concentration was high(> NaCl 80 mmol L~(-1)), V_(max) was Na~+ 1.81, 1.56, 2.11 and 2.11,mg g~(-1) h~(-1) and K_m 107.20, 70.29, 121.06 and 102.67 mmol L~(-1), respectively. In the low salt condition, the sodium exclusion rate was almost 90%, while in the high salt condition it was only 50% ~60%. Sodium exclusion rate varied slightly with the genotypes of winter wheat, and it was 50% higher of Xiaoyan- 6 and NR- 9405 than of Shaan-229 and RB- 6 in the low salt condition. On the contrary, the sodium absorption rate of Shaan-229 and RB- 6 was 15% higher than that of Xiaoyan- 6 and NR- 9405, while the sodium exclusion rate was 10% lower in the high salt condition, The higher sodium absorption rate and the lower sodium exclusion rate in the high salt condition may be responsible for the salt sensitivity of Shaan-229 and RB- 6.