Journal of Food, Agriculture and Environment

Different responses of wheat with different chromosome ploidies to water stress during seed–seedling transformation

Author(s):

Zheng-Hong Wang ^{1, 2}*, Wei Zhao ¹, Chun-Ping Wang ¹, Xiu-Pu Guo ¹, Shu-Fang Lv ¹, Xi-Ping Deng ²

Recieved Date: 2012-06-29, Accepted Date: 2012-10-04

Abstract:

In this study, seed germination, seedling growth and seed reserve utilization of three wheat species including Triticum boeoticum (diploid), T. dicoccoides (tetraploid) and T. aestivum (hexaploid), were investigated at different drought levels (osmotic potentials of 0, -0.3, -0.5 and -0.7 MPa).The objectives of this study were to characterize the evolutional tendency and assess the genetic variable response of germination characteristics and seedling growth to different drought levels in wheat from diploid to hexaploid. The results indicated that the one-hundred-seed weight, germination percentage, mean germination time, root length and root/shoot ratio of diploid wheat were significantly lower than those of tetraploid and hexaploid wheat (p<0.05), but germination index notably higher than that of tetraploid and hexaploid wheat (p<0.05), and there were no significant differences of these indexes between tetraploid and hexaploid wheat (p>0.05). With the evolution of wheat from diploid to hexaploid, the seed reserve depletion percentage (SRDP) of wheat remained a downward trend. However, opposite status (increased) showed in the seed reserve utilization efficiency (SRUE) of wheat. Moreover, the weight of utilized seed reserve and seedling dry weight of wheat exhibited diploid < hexaploid < tetraploid. Wheat with different chromosome ploidies had different responses to water stress during seed-seedling transformation. With the evolution of wheat, the resistance ability to drought gradually increased, which could be proved by some experimental results, such as less-affected germination percentage, healthier root length, higher root/shoot ratio and SRUE under decreasing osmotic pressure from -0.3 MPa to -0.7 MPa. However, in terms of adaptation to drought, diploid wheat water uptake rate, seed germination rate, SRDP and growth were more rapid.

Keywords:

Wheat, germination, seedling growth, reserve utilization, water stress

---

Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Agriculture
Pages: 879-882

---

Full text for Subscribers

---

Information:

Note to users

The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

---

Purchase this Article:   20 Purchase PDF Order Reprints for 15

---

Share this article :