中国水稻科学
中國水稻科學
중국수도과학
Chinese Journal of Rice Science
2015年
6期
637-647
,共11页
符冠富%张彩霞%杨雪芹%杨永杰%陈婷婷%赵霞%符卫蒙%奉保华%章秀福%陶龙兴%金千瑜
符冠富%張綵霞%楊雪芹%楊永傑%陳婷婷%趙霞%符衛矇%奉保華%章秀福%陶龍興%金韆瑜
부관부%장채하%양설근%양영걸%진정정%조하%부위몽%봉보화%장수복%도룡흥%금천유
水稻%水杨酸%高温胁迫%颖花分化
水稻%水楊痠%高溫脅迫%穎花分化
수도%수양산%고온협박%영화분화
rice%salicylic acid%heat stress%spikelet differentiation
水稻颖花原基分化期高温可抑制颖花分化,导致每穗粒数下降,最终会影响水稻产量的形成.以杂交稻甬优12为材料,探讨高温下不同浓度水杨酸(salicylic acid,SA)对水稻颖花分化的影响,并揭示其作用机制.研究表明,常温下适量 SA 促进水稻颖花分化,但高浓度SA 严重降低每穗粒数.然而高温下,10~50000μmol/L SA 处理每穗粒数均高于对照.无论常温或高温,100μmol/L 水杨酸处理效果最好,其每穗粒数及产量均显著高于对照.SA 增强水稻耐热性表现在三个方面：1)高温下SA 处理的叶片实际荧光量子效率及净光合速率均高于对照；2)高温下SA 处理的颖花SOD、POD 及CAT 活性显著高于对照,而MDA 含量则显著低于对照；3)无论高温或常温,SA 处理的颖花ZR 及IAA 含量均高于对照,尤其在高温下,差异达显著水平.
水稻穎花原基分化期高溫可抑製穎花分化,導緻每穗粒數下降,最終會影響水稻產量的形成.以雜交稻甬優12為材料,探討高溫下不同濃度水楊痠(salicylic acid,SA)對水稻穎花分化的影響,併揭示其作用機製.研究錶明,常溫下適量 SA 促進水稻穎花分化,但高濃度SA 嚴重降低每穗粒數.然而高溫下,10~50000μmol/L SA 處理每穗粒數均高于對照.無論常溫或高溫,100μmol/L 水楊痠處理效果最好,其每穗粒數及產量均顯著高于對照.SA 增彊水稻耐熱性錶現在三箇方麵：1)高溫下SA 處理的葉片實際熒光量子效率及淨光閤速率均高于對照；2)高溫下SA 處理的穎花SOD、POD 及CAT 活性顯著高于對照,而MDA 含量則顯著低于對照；3)無論高溫或常溫,SA 處理的穎花ZR 及IAA 含量均高于對照,尤其在高溫下,差異達顯著水平.
수도영화원기분화기고온가억제영화분화,도치매수립수하강,최종회영향수도산량적형성.이잡교도용우12위재료,탐토고온하불동농도수양산(salicylic acid,SA)대수도영화분화적영향,병게시기작용궤제.연구표명,상온하괄량 SA 촉진수도영화분화,단고농도SA 엄중강저매수립수.연이고온하,10~50000μmol/L SA 처리매수립수균고우대조.무론상온혹고온,100μmol/L 수양산처리효과최호,기매수립수급산량균현저고우대조.SA 증강수도내열성표현재삼개방면：1)고온하SA 처리적협편실제형광양자효솔급정광합속솔균고우대조；2)고온하SA 처리적영화SOD、POD 급CAT 활성현저고우대조,이MDA 함량칙현저저우대조；3)무론고온혹상온,SA 처리적영화ZR 급IAA 함량균고우대조,우기재고온하,차이체현저수평.
Heat stress at the spikelet primordium differentiation stage of rice significantly decreases the grain yield due to reduced grain number per panicle.The hybrid rice Yongyou 12 was used as material to investigate the role of salicylic acid(SA)in alleviating the negative effect on spikelet differentiation induced by heat stress.The results indicated that under natural conditions,low concentration of SA increased the spikelet number per panicle,while high concentration decreased the number.Interestingly,either low or high concentrations of SA (10-50000 μmol/L)increased the grain number per panicle under heat stress.The grain yield and grain number per panicle peaked under the treatment of 100μmol/L SA compared with their respective control (0 μmol/L)under both natural conditions and heat stress.This might attribute to the increase in the leaf photosynthesis rate,antioxidant enzyme activities,concentrations of auxin (IAA)and zeatin(ZR)in spikelets under heat stress.Heat stress occurred at spikelet differentiation stage seemed to cause little damage to the leaf,but the actual light quantum efficiency and net photosynthetic rate of leaf were increased when sprayed with SA.Accordingly,there was no significant difference in the activities of SOD,POD and CAT of leaf in rice.However,these antioxidant enzyme activities in spikelets were significantly decreased when subjected to heat stress,especially under the treatment of 0 μmol/L SA,suggesting that SA could enhance anti-oxidation.Further,SA could also prevent the decrease in the concentrations of IAA and ZR in spikelets induced by heat stress.In sum,SA ob-viously enhanced heat-resistance in rice at 100-1000 μmol/L.
