不同耐旱性紫花苜蓿干旱胁迫下生理响应和转录调控的差异研究

doi:10.3724/SP.J.1006.2023.24205

Abstract

Abstract:

Alfalfa is the most important legume forage, which is often planted in aird or semi-arid regions. The objective of this study is to explore the responsive mechanism of alfalfa with different drought tolerance to drought stress, which provides the theoretical basis for tolerant breeding of alfalfa. In this study, the new variety Medicago sativa ‘Zhongke 1’ was used as the test material, and M. sativa ‘Sanditi’ was used as the control. The effects of drought stress on growth traits, photosynthesis, chlorophyll concentration, leaf water content, osmotic adjustment substances, and antioxidant enzyme activities were determined by natural drought strategy in pots. The deferentially expressed genes were compared by transcriptome analysis. Drought stress significantly reduced plant height, biomass, relative water content of leaves, photosynthetic rate, transpiration rate, stomatal conductance, intercellular carbon dioxide and chlorophyll concentration of alfalfa. Compared with Sanditi, Zhongke 1 revealed the lower malondialdehyde concentration and electrical conductivity under drought stress, but stronger osmotic regulation ability and superoxide radical scavenging ability. Transcriptome sequencing identified 5308 and 8053 drought-responsive genes of Zhongke 1 and Sanditi, respectively. GO functional annotation demonstrated that 346 drought-responsive genes were significantly enriched in six GO item categories in Zhongke 1, while 1683 drought-responsive genes in Sanditi were significantly enriched in 29 GO item categories. The relative expression levels of 19 key drought-tolerant genes in Zhongke 1 were significantly higher than those in Sanditi. Alfalfa may maintain a relatively high photosynthetic rate by up-regulating the relative expression levels of drought tolerant genes SUS, P5CS, LEA, SOD, POD, PEPC, and NCED, thus improving osmotic regulation ability and antioxidant enzyme activity. The results provide a theoretical basis for further exploration of alfalfa’s candidate genes in response to drought stress and drought tolerant breeding.

Key words: alfalfa, drought stress, physiological characteristics, transcriptome

CHEN Li, WANG Jing, QIU Xiao, SUN Hai-Lian, ZHANG Wen-Hao, WANG Tian-Zuo. Differences of physiological responses and transcriptional regulation of alfalfa with different drought tolerances under drought stresses[J].Acta Agronomica Sinica, 2023, 49(8): 2122-2132.

Figures/Tables 9

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Table 1

Table 2

GO annotation of differentially expressed genes between drought and control treatment in Sanditi"

类别 Category	基因本体ID GO ID	描述 Description	多重假设检验校正后的P值 P-adj value	基因数 No. of genes
CC	GO:0009521	光系统Photosystem	0.01×10^-5	32
CC	GO:0034357	光合膜Photosynthetic membrane	0.01×10^-5	32
CC	GO:0009579	类囊体Thylakoid	0.01×10^-5	33
CC	GO:0044436	类囊体部分Thylakoid part	0.01×10^-5	33
MF	GO:0016757	转移酶活性, 转移糖基Transferase activity, transferring glycosyl groups	0.08×10^-5	149
CC	GO:0009523	光系统II Photosystem II	0.03×10^-3	20
MF	GO:0016758	转移酶活性, 转移己糖基团Transferase activity, transferring hexosyl groups	0.04×10^-3	132
MF	GO:0004185	丝氨酸型羧肽酶活性Serine-type carboxypeptidase activity	0.04×10^-3	29
MF	GO:0046906	四吡咯结合Tetrapyrrole binding	0.04×10^-3	131
MF	GO:0016705	氧化还原酶活性, 作用于配对供体, 结合或减少分子氧 Oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen	0.04×10^-3	113
BP	GO:0015979	光合作用Photosynthesis	0.01×10^-2	38
CC	GO:0009654	光系统II析氧复合物Photosystem II oxygen evolving complex	0.02×10^-2	14
CC	GO:0042651	类囊体膜Thylakoid membrane	0.08×10^-2	14
CC	GO:1990204	氧化还原酶复合物Oxidoreductase complex	0.08×10^-2	14
MF	GO:0005506	铁离子结合Iron ion binding	0.09×10^-2	119
CC	GO:0019898	膜的外在成分Extrinsic component of membrane	0.04×10^-1	13
MF	GO:0003700	DNA结合转录因子活性DNA-binding transcription factor activity	0.07×10^-1	116
MF	GO:0016835	碳氧裂解酶活性Carbon-oxygen lyase activity	0.01	26
CC	GO:0009522	光系统I Photosystem I	0.02	10
MF	GO:0016747	转移酶活性, 转移除氨酰基以外的酰基 Transferase activity, transferring acyl groups other than amino-acyl groups	0.02	64
MF	GO:0008236	丝氨酸型肽酶活性Serine-type peptidase activity	0.02	64
MF	GO:0020037	血红素结合Heme binding	0.02	129
MF	GO:0004180	羧肽酶活性Carboxypeptidase activity	0.03	29
MF	GO:0070008	丝氨酸型外肽酶活性Serine-type exopeptidase activity	0.03	30
MF	GO:0016746	转移酶活性, 转移酰基Transferase activity, transferring acyl groups	0.03	76
MF	GO:0017171	丝氨酸水解酶活性Serine hydrolase activity	0.03	64
MF	GO:0016701	氧化还原酶活性, 作用于单个供体并结合分子氧 Oxidoreductase activity, acting on single donors with incorporation of molecular oxygen	0.04	26
MF	GO:0140110	转录调节活性Transcription regulator activity	0.04	122
MF	GO:0008374	O-酰基转移酶活性O-acyltransferase activity	0.04	11

Table 2

Fig. 7

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类别 Categories	基因本体ID GO ID	描述 Description	多重假设检验校正后的P值 P-adj value	基因数 No. of genes
CC	GO:0005618	细胞壁Cell wall	0.02	21
CC	GO:0030312	外封装结构External encapsulating structure	0.02	21
MF	GO:0046906	四吡咯结合Tetrapyrrole binding	0.05	85
MF	GO:0016788	水解酶活性, 作用于酯键Hydrolase activity, acting on ester bonds	0.05	94
MF	GO:0020037	血红素结合Heme binding	0.05	82
MF	GO:0004553	水解酶活性, 水解O-糖基化合物 Hydrolase activity, hydrolyzing O-glycosyl compounds	0.05	85

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