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Stella Owusu-Nketia Jonaliza Lanceras Siangliw Meechai Siangliw Theerayut Toojinda Apichart Vanavichit Noppon Ratsameejanphen 《Plant Production Science》2018,21(3):266-277
Soil moisture fluctuation (SMF) stress due to erratic rainfall in rainfed lowland (RFL) rice ecosystems negatively affect production. Under such condition, root plasticity is one of the key traits that play important roles for plant adaptation. This study aimed to evaluate root plasticity expression and its functional roles in water uptake, dry matter production and yield under SMF using three chromosome segment substitution lines (CSSLs) with major genetic background of KDML105 and a common substituted segment in chromosome 8. The CSSLs showed greater shoot dry matter production than KDML105 under SMF, which was attributed to the maintenance of stomatal conductance resulting in higher grain yield. The root system development based on total root length of the CSSLs were significantly higher than that of KDML105 due to the promoted production of nodal and lateral roots. These results implied that the common substituted segments in chromosome 8 of the 3 CSSLs may be responsible for the expression of their root plasticity under SMF and contributed to the increase in water uptake and consequently dry matter production and yield. These CSSLs could be used as a good source of genetic material for drought resistance breeding programs targeting rainfed lowland condition with fluctuating soil moisture environments and for further genetic studies to elucidate mechanisms underlying root plasticity. 相似文献
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Ideotype breeding for submergence tolerance and cooking quality by marker-assisted selection in rice 总被引:1,自引:0,他引:1
J. JantaboonM. Siangliw S. Im-markW. Jamboonsri A. VanavichitT. Toojinda 《Field Crops Research》2011,123(3):206-213
Submergence tolerance and jasmine-like cooking quality are desirable for rice varieties grown in rainfed and irrigated lowland ecosystems in the Mekong region of Southeast Asia. Hybridization between varieties IR57514 and Kao Dawk Mali 105 (KDML105) was initiated with the goal of producing an ideotype that combines submergence tolerance and jasmine-like cooking quality. Through the single seed descent (SSD) method, a large population of recombinant inbred lines (RILs) was developed, and we demonstrated the potential of using marker-assisted selection (MAS) in the identification of the ideotype from the offspring. Four markers, R10783Indel, Waxy, Aromarker and GT11, were used to select the favored alleles of the Sub1, Wx, badh2 and SSIIa loci, respectively. The ideotype was classified into two groups: ideotype1 (ID1), carrying the Sub1IR, badh2KD, WxKD and SSIIaKD alleles and consisting of 66 RILs and ideotype2 (ID2), carrying the Sub1IR, badh2KD, WxKD and SSIIaIR alleles and consisting of 31 RILs. Submergence tolerance, cooking quality, grain quality and agronomic characteristics of the IDs were evaluated and compared with those of the parents. All of the ID1 lines exhibited submergence tolerance and jasmine-like cooking quality and displayed a low amylose content, a fragrance and a high alkali spreading value, whereas the ID2s showed the same characteristics as ID1, except for a low alkali spreading value, which was inherited from IR57514. A wide range of agronomic characteristics was observed in both of the ID groups, and some of the IDs were superior in the yield component, as compared to their parents. This study provides further support that the precision of markers used in MAS can enhance the development of ideotypes in rice. 相似文献
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