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Different response of an elite Bt restorer line of hybrid rice (Oryza sativa L.) in adaptation to nitrogen deficiency

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Abstract

Transgenic Bacillus thuringiensis (Bt) rice have been reported to acquire effective resistance against the target pests; however, the insertion and expression of alien Bt genes may have some unintended effects on the growth characteristics of rice. A screen-house experiment was conducted and repeated twice to investigate the growth characteristics and Bt protein expressions in two Bt rice lines [MH63 (Cry2A*) and MH63 (Cry1Ab/Ac)], which had different Bt protein expression levels in leaves, under zero nitrogen (N0) and recommended nitrogen (NR) fertilizer applications. Compared to the counterpart MH63, MH63 (Cry2A*) under N0 experienced accelerated leaf senescence and a lower internal N use efficiency (IEN), resulting in a 23.2% decrease in grain yield and a lower accumulated biomass. These variations were revealed to be correlated to the higher ratio of the Bt protein content to the soluble protein content (BTC/SPC) with a maximum value of 4.3‰ in MH63 (Cry2A*) leaves in the late growth stage. Under NR, no differences in growth characteristics between MH63 (Cry2A*) and MH63 were found. The growth characteristics of MH63 (Cry1Ab/Ac), with a lower BTC/SPC in the late growth stage compared to MH63 (Cry2A*), were identical to those of MH63 under the two N applications. Results show that the transgenic Bt rice MH63 (Cry2A*), with a relatively higher Bt protein expression in the late growth stage, had an inferior adaptation to nitrogen deficiency compared to its non-Bt counterpart. And this inferior adaptation was found to be correlated with the higher BTC/SPC in MH63 (Cry2A*) leaves in the late growth stage.

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Abbreviations

AEN :

N agronomic efficiency

Bt :

Bacillus thuringiensis

BTC/SPC:

Ratio of the Bt protein content to the soluble protein content

BTC:

Bt protein content

C:

Carbon

CMS:

Cytoplasm male sterile

FL:

Flowering stage

FS:

Filling stage

IEN :

Internal N use efficiency

K:

Potassium

LSD:

Least significant difference

MT:

Mid-tillering stage

N0:

Zero nitrogen

NPR:

Net photosynthetic rate

NR:

Recommended nitrogen

NUE:

N use efficiency

P:

Phosphorus

PEN :

N physiological efficiency

PFPN :

N partial factor productivity

PI:

Panicle initiation stage

PM:

Plant maturity stage

REN :

N recovery efficiency

SD:

Standard deviation

SPC:

Soluble protein content

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Acknowledgements

We express our gratitude to the National Key Laboratory of Crop Genetic Improvement for providing the seeds of MH63 (Cry2A*) and MH63 (Cry1Ab/Ac). This work was funded by the National Natural Science Foundation of China (No. 31371570).

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Correspondence to Cougui Cao.

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Communicated by Z.-L. Zhang.

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11738_2017_2384_MOESM1_ESM.tif

Fig. S1 Total N uptakes of Bt-MH63 and MH63 under different N applications in 2012 and 2013. Lowercase letters indicate LSD (α=0.05) grouping of means across genotypes within an N application for each year. Columns with the same letter are not significantly different. The vertical bars indicate standard deviations (TIFF 1082 kb)

11738_2017_2384_MOESM2_ESM.jpg

Fig. S2 Pot experiment in the screen-house at Huazhong Agricultural University, Wuhan City (29°58′N 113°53′E), Hubei Province, China (JPEG 3341 kb)

Supplementary material 3 (DOCX 12 kb)

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Jiang, Y., Ling, L., Zhang, L. et al. Different response of an elite Bt restorer line of hybrid rice (Oryza sativa L.) in adaptation to nitrogen deficiency. Acta Physiol Plant 39, 89 (2017). https://doi.org/10.1007/s11738-017-2384-y

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  • DOI: https://doi.org/10.1007/s11738-017-2384-y

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