Exploring and exploiting genetics and genomics for sweetpotato improvement: Status and perspectives

Yan, Mengxiao; Nie, Haozhen; Wang, Yunze; Wang, Xinyi; Jarret, Robert L.; Zhao, Jiamin; Wang, Hongxia; Yang, Jeong-Mo

doi:10.1016/j.xplc.2022.100332

Cited by 60 publications

(52 citation statements)

References 169 publications

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“…Consistent with the phylogenetic tree, the number and composition of motifs differed among proteins that are distantly related, such as IbCCD4 and CsCCD4, which may lead to different substrates and cleavage products. Closely related proteins, such as CitCCD4 and CitCCD4b, contain almost similar motif numbers and compositions ( Figure 1 C); however, their substrate and cleavage products are very different [ 43 , 44 ]. This suggests that, even if they contain the same motif, the substrates and cleavage products of CCD4 proteins may be different.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, developing salt-resistant sweet potato varieties is important to improve quality and yield performance. Some sweet potato varieties with salt-resistance (such as LM79, Taizhong-9, Shushu-7, Longshu-1, and Xushu-18) have been obtained by classical breeding [ 40 , 41 , 42 ]; however, molecular breeding is faster and more efficient [ 43 ]. The functional analysis of salt stress-related genes can lay a solid foundation for breeding salt-resistant varieties and improving the yield of sweet potato under salt stress.…”

Section: Introductionmentioning

confidence: 99%

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Overexpression of Sweet Potato Carotenoid Cleavage Dioxygenase 4 (IbCCD4) Decreased Salt Tolerance in Arabidopsis thaliana

Zhang

Dong

et al. 2022

IJMS

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Salt stress has a serious impact on normal plant growth and yield. Carotenoid cleavage dioxygenase (CCD) degrades carotenoids to produce apocarotenoids, which are involved in plant responses to biotic and abiotic stresses. This study shows that the expression of sweet potato IbCCD4 was significantly induced by salt and dehydration stress. The heterologous expression of IbCCD4 in Arabidopsis was induced to confirm its salt tolerance. Under 200 mM NaCl treatment, compared to wild-type plants, the rosette leaves of IbCCD4-overexpressing Arabidopsis showed increased anthocyanins and carotenoid contents, an increased expression of most genes in the carotenoid metabolic pathway, and increased malondialdehyde (MDA) levels. IbCCD4-overexpressing lines also showed a decreased expression of resistance-related genes and a lower activity of three antioxidant enzymes: peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT). These results indicate that IbCCD4 reduced salt tolerance in Arabidopsis, which contributes to the understanding of the role of IbCCD4 in salt stress.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overexpression of Sweet Potato Carotenoid Cleavage Dioxygenase 4 (IbCCD4) Decreased Salt Tolerance in Arabidopsis thaliana

Zhang

Dong

et al. 2022

IJMS

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“…However, I. batatas 4x was previously identified as the hybrid between I. trifida and sweetpotato 23 . The key to confirm the tetraploid progenitor is to establish an effective standard to distinguish the possible tetraploid progenitor and the hybrid offspring 21 . Therefore, we simulated three hybrids between sweetpotato and I. trifida and they clustered within the sweetpotato clade instead of the basal 4x clade ( I. batatas 4x).…”

Section: Discussionmentioning

confidence: 99%

“…However, both cytogenetic and recent genomic analyses suggest that sweetpotato (B 1 B 1 B 2 B 2 B 2 B 2 ) composed of two subgenomes and arose from a cross between a diploid and a tetraploid progenitor 19,20 . The diploid progenitor is most likely I. trifida , whereas the tetraploid progenitor has remained debated 21 . Based on a phylogenetic analyses of homologous haplotypes, Yan et al 22 suggested the tetraploid progenitor of sweetpotato is I. batatas 4x.…”

Section: Introductionmentioning

confidence: 99%

Horizontal transferred T-DNA and haplotype-based phylogenetic analysis uncovers the origin of sweetpotato

Yan

Wang

et al. 2022

Preprint

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The hexaploid sweetpotato is one of the most important root crops worldwide. However, its genetic origins are controversial. In this study, we identified two progenitors of sweetpotato by horizontal gene transferred IbT-DNA and haplotype-based phylogenetic analysis. The diploid progenitor is the diploid form of I. aequatoriensis, contributed the B1 subgenome, IbT-DNA2 and lineage 2 type of chloroplast genome to sweetpotato. The tetraploid progenitor of sweetpotato is I. batatas 4x, donating the B2 subgenome, IbT-DNA1 and lineage 1 type of chloroplast genome. Sweetpotato derived from the reciprocal cross between the diploid and tetraploid progenitors and a subsequent whole genome duplication. We also detected biased gene exchanges between subgenomes. The B1 to B2 subgenome conversions were almost 3-fold higher than the B2 to B1 subgenome conversions. This study sheds lights on the evolution of sweetpotato and paves a way for the improvement of sweetpotato.

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“…Sweetpotato ( Ipomoea batatas ), the seventh most important food crop species worldwide, is harvested from its below-ground storage root (SR) [ 11 ]. Sweetpotato is a hexaploid (B 1 B 1 B 2 B 2 B 2 B 2 ) with 90 chromosomes, which has a high degree of heterozygosity and high number of repetitive sequences [ 12 , 13 ], thus hindering gene identification and functional research, especially those involved in SR development. To date, only several genes have been reported involved in sweetpotato SR development, such as IbEXP1 , IbMADS1 , SRD1 , SRF1 , KNOXI and IbBBX24 [ 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Identification and Expression Analysis of Expansin Gene Family in the Storage Root Development of Diploid Wild Sweetpotato Ipomoea trifida

Chen

Lang

et al. 2022

Genes

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Expansins play important roles in root growth and development, but investigation of the expansin gene family has not yet been reported in Ipomoea trifida, and little is known regarding storage root (SR) development. In this work, we identified a total of 37 expansins (ItrEXPs) in our previously reported SR-forming I. trifida cv. Y22 genome, which included 23 ItrEXPAs, 4 ItrEXPBs, 2 ItrEXLAs and 8 ItrEXLBs. The phylogenetic relationship, genome localization, subcellular localization, gene and protein structure, promoter cis-regulating elements, and protein interaction network were systematically analyzed to reveal the possible roles of ItrEXPs in the SR development of I. trifida. The gene expression profiling in Y22 SR development revealed that ItrEXPAs and ItrEXLBs were down-regulated, and ItrEXPBs were up-regulated while ItrEXLAs were not obviously changed during the critical period of SR expansion, and might be beneficial to SR development. Combining the tissue-specific expression in young SR transverse sections of Y22 and sweetpotato tissue, we deduced that ItrEXLB05, ItrEXLB07 and ItrEXLB08 might be the key genes for initial SR formation and enlargement, and ItrEXLA02 might be the key gene for root growth and development. This work provides new insights into the functions of the expansin gene family members in I. trifida, especially for EXLA and EXLB subfamilies genes in SR development.

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Exploring and exploiting genetics and genomics for sweetpotato improvement: Status and perspectives

Cited by 60 publications

References 169 publications

Overexpression of Sweet Potato Carotenoid Cleavage Dioxygenase 4 (IbCCD4) Decreased Salt Tolerance in Arabidopsis thaliana

Overexpression of Sweet Potato Carotenoid Cleavage Dioxygenase 4 (IbCCD4) Decreased Salt Tolerance in Arabidopsis thaliana

Horizontal transferred T-DNA and haplotype-based phylogenetic analysis uncovers the origin of sweetpotato

Genome-Wide Identification and Expression Analysis of Expansin Gene Family in the Storage Root Development of Diploid Wild Sweetpotato Ipomoea trifida

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