Variation in Seed Germination and Amylase Activity of Diverse Carrot [Daucus carota (L.)] Germplasm under Simulated Drought Stress

13Citations
Citations of this article
15Readers
Mendeley users who have this article in their library.

Abstract

Drought is one of the major environmental challenges constraining the production of agricultural crops, including carrot. Seed germination is the initial and most critical stage of crop establishment, and it is very sensitive to drought stress because water scarcity affects the enzymatic solubilization of stored metabolites in seeds that provide energy for the growth of germinating embryo. Few studies evaluating the effect of drought stress on carrot seed germination of more than a few cultivars grown under stress have been published. Therefore, the present study was designed to define the appropriate osmotic potential for evaluating drought tolerance of carrot, evaluate the response of diverse carrot germplasm to drought stress during seed germination to identify drought-tolerant accessions that may be used by plant breeders, and evaluate the relation between amylase activity and germination rate of drought-tolerant and drought-sensitive accessions. To identify an appropriate screening osmotic potential, two commercial cultivars and two United States Department of Agriculture inbreeds were evaluated at six osmotic potentials (00, 20.30, 20.51, 20.58, 20.80, and 21.05 MPa); 20.58 MPa was identified as the optimal osmotic potential for screening the drought tolerance of carrot seed. Cultivated and wild carrot plant introductions (PIs) (n 5 200 and n 5 50, respectively) from the National Plant Germplasm System were evaluated for drought tolerance under nonstress and simulated drought stress conditions (00 MPa and 20.58 MPa, respectively) by calculating the absolute decrease (AD) in percent germination, inhibition index (II), relative drought tolerance (RDT), and drought tolerance index (DTI). All measurements of drought tolerance identified significant differences among accessions; the AD in seed germination ranged from 0.0% to 69.3%, II ranged from 0.0% to 80.2%, RDT ranged from 0.2 to 1.0, and DTI ranged from 0.13 to 1.47. All wild carrot accessions displayed low levels of drought tolerance, but PI 652387 and PI 177381 (both from Turkey) and PI 274297 (Pakistan) were most drought-sensitive, whereas cultivated accessions PI 643114 (United States), PI 652208 (China), and PI 502347 (Uzbekistan) were most drought-tolerant. Tolerant accessions displayed much higher a-amylase activity under nonstress conditions than sensitive accessions, and a-amylase activity of tolerant accessions was also reduced less with seed germination under increasing osmotic potential (range, 0.0 to 21.05 MPa) than sensitive accessions over 24, 48, and 72 hours of seed germination. This is the first evaluation of drought stress tolerance during seed germination and the enzymatic response of diverse carrot germplasms under simulated drought stress.

References Powered by Scopus

Crop production under drought and heat stress: Plant responses and management options

1877Citations
N/AReaders
Get full text

ABA-mediated transcriptional regulation in response to osmotic stress in plants

830Citations
N/AReaders
Get full text

The use of wild relatives in crop improvement: A survey of developments over the last 20 years

816Citations
N/AReaders
Get full text

Cited by Powered by Scopus

Comprehensive review: Effects of climate change and greenhouse gases emission relevance to environmental stress on horticultural crops and management

44Citations
N/AReaders
Get full text

An Accessible Method to Improve the Stability and Reusability of Porcine Pancreatic α-Amylase via Immobilization in Gellan-Based Hydrogel Particles Obtained by Ionic Cross-Linking with Mg<sup>2+</sup> Ions

7Citations
N/AReaders
Get full text

Horticulture crop under pressure: Unraveling the impact of climate change on nutrition and fruit cracking

4Citations
N/AReaders
Get full text

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Cite

CITATION STYLE

APA

Nijabat, A., Manzoor, S., Faiz, S., Naveed, N. H., Bolton, A., Khan, B. A., … Simon, P. (2023). Variation in Seed Germination and Amylase Activity of Diverse Carrot [Daucus carota (L.)] Germplasm under Simulated Drought Stress. HortScience, 58(2), 205–214. https://doi.org/10.21273/HORTSCI16806-22

Readers' Seniority

Tooltip

PhD / Post grad / Masters / Doc 5

56%

Professor / Associate Prof. 2

22%

Researcher 2

22%

Readers' Discipline

Tooltip

Agricultural and Biological Sciences 6

67%

Biochemistry, Genetics and Molecular Bi... 2

22%

Nursing and Health Professions 1

11%

Save time finding and organizing research with Mendeley

Sign up for free