Root-specific expression of chickpea cytokinin oxidase/dehydrogenase 6 leads to enhanced root growth, drought tolerance and yield without compromising nodulation

被引：47

作者：

Khandal, Hitaishi ^{[1
]}

Gupta, Santosh Kumar ^{[1
]}

Dwivedi, Vikas ^{[1
]}

Mandal, Drishti ^{[1
]}

Sharma, Nilesh Kumar ^{[1
]}

Vishwakarma, Niraj Kumar ^{[1
]}

Pal, Lalita ^{[1
]}

Choudhary, Megha ^{[1
]}

Francis, Aleena ^{[1
]}

Malakar, Paheli ^{[1
]}

Singh, Nagendra Pratap ^{[1
]}

Sharma, Kapil ^{[2
]}

Sinharoy, Senjuti ^{[1
]}

Singh, Narendra Pratap ^{[3
]}

Sharma, Rameshwar ^{[2
]}

Chattopadhyay, Debasis ^{[1
]}

机构：

[1] Natl Inst Plant Genome Res, New Delhi, India

[2] Univ Hyderabad, Dept Plant Sci, Repository Tomato Genom Resources, Hyderabad, India

[3] Indian Inst Pulses Res, Kanpur, Uttar Pradesh, India

来源：

PLANT BIOTECHNOLOGY JOURNAL | 2020年 / 18卷 / 11期

关键词：

CaCKX6; Cicer arietinumL; cytokinin; drought tolerance; mineral; root; CICER-ARIETINUM L; ABSCISIC-ACID; PLANT-GROWTH; SHOOT GROWTH; SEED YIELD; ARABIDOPSIS; GENES; MERISTEM; SYSTEM; SINK;

D O I：

10.1111/pbi.13378

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Cytokinin group of phytohormones regulate root elongation and branching during post-embryonic development. Cytokinin-degrading enzymes cytokinin oxidases/dehydrogenases (CKXs) have been deployed to investigate biological activities of cytokinin and to engineer root growth. We expressed chickpea cytokinin oxidase 6 (CaCKX6) under the control of a chickpea root-specific promoter ofCaWRKY31inArabidopsis thalianaand chickpea having determinate and indeterminate growth patterns, respectively, to study the effect of cytokinin depletion on root growth and drought tolerance. Root-specific expression ofCaCKX6led to a significant increase in lateral root number and root biomass inArabidopsisand chickpea without any penalty to vegetative and reproductive growth of shoot. Transgenic chickpea lines showed increasedCKXactivity in root. Soil-grown advanced chickpea transgenic lines exhibited higher root-to-shoot biomass ratio and enhanced long-term drought tolerance. These chickpea lines were not compromised in root nodulation and nitrogen fixation. The seed yield in some lines was up to 25% higher with no penalty in protein content. Transgenic chickpea seeds possessed higher levels of zinc, iron, potassium and copper. Our results demonstrated the potential of cytokinin level manipulation in increasing lateral root number and root biomass for agronomic trait improvement in an edible legume crop with indeterminate growth habit.

引用

页码：2225 / 2240

页数：16

共 91 条

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