High-yielding nitrate transporter cultivars also mitigate methane and nitrous oxide emissions in paddy
文献类型： 外文期刊
作者： Iqbal, Muhammad Faseeh 1 ; Zhang, Yong 3 ; Kong, Pulin 1 ; Wang, Yulong 1 ; Cao, Kaixun 4 ; Zhao, Limei 1 ; Xiao, Xin 4 ; Fan, Xiaorong 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Natl Key Lab Crop Genet Germplasm Enhancement & Ut, Nanjing, Peoples R China
2.Nanjing Agr Univ, Coll Resources & Environm Sci, Key Lab Plant Nutr & Fertilizat Lowermiddle Reache, Minist Agr, Nanjing, Peoples R China
3.Jiangsu Acad Agr Sci, Inst Food Crops, Jiangsu High Qual Rice Res & Dev Ctr, Nanjing Branch,China Natl Ctr Rice improvement, Nanjing, Peoples R China
4.Anhui Sci & Technol Univ, Coll Resource & Environm, Chuzhou, Peoples R China
5.Anqing Normal Univ, Coll Resource & Environm, Anqing, Peoples R China
6.Zhongshan Biol Breeding Lab, Nanjing, Peoples R China
关键词： sustainable agriculture; food security; greenhouse gases mitigation; climate-smart strategies; methanogens; nitrate transporters
期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）
ISSN： 1664-462X
年卷期： 2023 年 14 卷
页码：
收录情况： SCI
摘要： Development of high yield rice varieties is critical to ensuring global food security. However, the emission of greenhouse gases (GHG) such as Methane (CH4) and Nitrous oxide (N2O) from paddy fields threatens environmental sustainability. In this study, we selected overexpressed high-affinity nitrate transporters (NRT2.3 along with their partner protein NAR2.1) cultivars, which are effective nitrogen use efficient transgenic lines pOsNAR2.1: OsNAR2.1 (Ox2) and p35S:OsNRT2.3b (O8). We used high (270 kg N/ha) and low (90 kg N/ha) nitrogen (N) fertilizers in paddy fields to evaluate morphophysiological traits, including GHG emission. We found that Ox2 and O8 reduced CH4 emissions by 40% and 60%, respectively, compared to their wild type (WT). During growth stages, there was no consistent N2O discharge pattern between WT and transgenics (Ox2, O8) in low and high N application. However, total cumulative N2O in a cropping season reduced in O8 and increased in Ox2 cultivars, compared to WT. Root aerenchyma formation reduced by 30-60% in transgenic lines. Methanogens like mcrA in low and high N were also reduced by up to 50% from rhizosphere of Ox2 and O8. However, the nitrifying bacterial population such as nosZ reduced in both transgenics significantly, but nirK and nirS did not show a consistent variation. The high yield of transgenic rice with limited aerenchyma mitigates the discharge of CH4 and N2O by reducing root exudates that provide substrates for GHG. Our results improve understanding for breeders to serve the purpose of sustainable development.
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