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The importance of calcium in improving resistance of Daphnia to Microcystis.

ABSTRACT: Changing environmental calcium (Ca) and rising cyanobacterial blooms in lake habitats could strongly reduce Daphnia growth and survival. Here, we assessed the effects of maternal Ca in Daphnia on transfer of resistance to their offspring against Microcystis aeruginosa PCC7806 (M. aeruginosa). Laboratory microcosm experiments were performed to examine effects in Daphnia carinata (D. carinata) and Daphnia pulex (D. pulex), and that how Ca induce responses in their offspring. The results showed that growth and survival were increased in offspring from exposed Daphnia as compared to unexposed, when raised in high Ca and increasing M. aeruginosa concentration. Among exposed Daphnia, offspring from high Ca mothers, produced more neonates with large size and higher survival as compared to offspring from low maternal Ca. Exposed D. carinata and D. pulex offspring, when reared in Ca deficient medium and increasing M. aeruginosa concentration, time to first brood increased, size become large and total offspring decreased subsequently in three alternative broods in offspring from low maternal Ca. In contrast, growth and reproduction in offspring from high Ca exposed mothers were consistent in three alternative broods. Despite species specific responses in growth, survival and variant life history traits in two Daphnia species, our results not only show maternal induction in Daphnia but also highlight that offspring response to M. aeruginosa varies with maternal Ca. This study demonstrates that Ca have role in Daphnia maternal induction against Microcystis, and recent Ca decline and increasing Microcystis concentration in lakes may decrease Daphnia growth and survival. Our data provide insights into the interactive effect of maternal Ca and Microcystis exposure on Daphnia and their outcome on offspring life history traits and survival.

SUBMITTER: Akbar S

PROVIDER: S-EPMC5393884 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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The importance of calcium in improving resistance of Daphnia to Microcystis.

Akbar Siddiq S Du Jingjing J Jia Yong Y Tian Xingjun X

PloS one 20170417 4

Changing environmental calcium (Ca) and rising cyanobacterial blooms in lake habitats could strongly reduce Daphnia growth and survival. Here, we assessed the effects of maternal Ca in Daphnia on transfer of resistance to their offspring against Microcystis aeruginosa PCC7806 (M. aeruginosa). Laboratory microcosm experiments were performed to examine effects in Daphnia carinata (D. carinata) and Daphnia pulex (D. pulex), and that how Ca induce responses in their offspring. The results showed tha ...[more]

PMID: 28414773

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Project description:Lake eutrophication and cyanobacterial blooms have become worldwide environmental issues. Under cyanobacterial blooms (especially Microcystis), Daphnia spp. can transfer beneficial information to their offspring in order to improve adaptability. Hox genes are important regulatory factors of transcription in metazoans, and are involved in the growth and development of organisms. However, the mechanisms of Microcystis on the expression of Hox genes in Daphnia are unclear. In this study, the effects of Microcystis aeruginosa on Hox gene expression in the mothers and offspring (F1) of two Daphnia similoides sinensis clones were investigated using a mixed diet of M. aeruginosa and Scenedesmus obliquus. Compared with the 100%S food treatment, the survival rates at the end of the experiment of clone 1-F1 in the food treatments containing M. aeruginosa were significantly lower, but it was significantly higher for clone 2-F1 in the 20%M + 80%S food treatment. Moreover, the survival rates at the end of the experiment of clone 1-F1 in the food treatments containing M. aeruginosa were significantly higher than those of their mother. Based on previous transcriptome data, 14 Hox genes of D. similoides sinensis were identified, including Abd-B, CDX-1, Dll, HOX-1, HOX-2, HOXA1, HOXA2, HOXB3, HOXB3-2, HOXB7, HOXC4, HOXC7, HOXC8, and HOXD10. The expressions of Abd-B, HOX-2, HOXA1, HOXC7, and HOXD10 of clone 2-mothers in the 40%M + 60%S food treatment were 2.9-22.5 times as high as in the 100%S food treatment, whereas the expressions of CDX-1, HOX-1, HOXB3, and HOXD10 of clone 1-mothers were 4.8-13.1 times at same food level. The expression of HOXA2, HOXC7, HOXC8, and HOXD10 of clone 1-F1 in the 40%M + 60%S food treatment was 8.2-21.1 times as high as in the 100%S food treatment. However, compared with the 100%S food treatment, the expressions of CDX-1 in the mothers and F1 of clone 2 and HOXB7 in the mothers of clone 1 in the food treatments containing M. aeruginosa were significantly lower (p < .05). Our results suggest that the offspring (F1) produced by D. similoides sinensis mother pre-exposed to toxic M. aeruginosa had stronger adaptability to M. aeruginosa than their mothers. Moreover, Hox gene expressions of D. similoides sinensis had obvious differences between clones under stress of toxic M. aeruginosa.

Dataset Information

The importance of calcium in improving resistance of Daphnia to Microcystis.

Publications

The importance of calcium in improving resistance of Daphnia to Microcystis.

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