Navigation Links
The amazing maze of maize evolution
Date:10/2/2009

Understanding the evolution and domestication of maize has been a holy grail for many researchers. As one of the most important crops worldwide and as a crop that appears very different from its wild relatives as a result of domestication, understanding exactly how maize has evolved has many practical benefits and may help to improve crop yields.

In the October issue of the American Journal of Botany (www.amjbot.org/cgi/content/full/96/10/1798), Dr. Marina Dermastia and colleagues published their research comparing corn kernel development to its closest wild relative: teosinte. This research overturns some commonly held beliefs on the domestication of maize because, unexpectedly, many traits seen in the cellular development of maize kernels that were previously attributed to the process of domestication were observed in the development of the teosinte kernels by Dermastia and her colleagues. "Although the teosinte kernels are morphologically so different from that of maize, their inside is not, Dermastia said. "Although we did not expect fundamental differences between maize and teosinte, the similarities were striking."

Some of the traits thought to be unique to maize but now also found in teosinte include an early programmed cell death for cells in part of the kernel and accumulation of phenolic and flavonoid compounds in the walls of these cells. These developmental changes strengthen the cells, protect them against decay and disease, and increase water conductance. According to Dermastia, "We suggested previously that this process was important for the establishment of the water and assimilate flow to the developing maize kernelin the teosinte kernel, we not only detected programmed cell deathbut also all other phenomena described as related to the transport into the maize kernel." The presence of these traits in teosinte kernels suggests that they are not a consequence of maize domestication.

Other developmental traits they observed in the teosinte kernels included the presence of an enzyme that controls the flow of sugar in the developing seed, which appears to be a common mechanism for sugar uptake in both maize and teosinte.

Dermastia and her colleagues did observe one difference between seed development in teosinte and maize. Endoreduplication, the process of a cell duplicating its DNA without subsequent cell division, is a phenomenon that occurs in the endosperm of cereals, which is the nutritious part of the seed. An increasing rate of endoreduplication results in cells with greater DNA content and, subsequently, increased gene expression and greater sink capacity for the developing seed. Dermastia and her colleagues observed that the distribution of cells with high DNA content in maize differs from that of teosinte. In maize, these cells are found in the upper part of the endosperm, while in teosinte they are distributed throughout the endosperm. The researchers hypothesize that this difference may be related to more efficient starch deposition in maize as a result of domestication.

"Our study indicates that the main differences, beside the teosinte fruitcase and its absence in maize, might lay in the process of endoreduplication in endosperm, Dermastia said. "Knowing the process in more depth might be an important step in improving a most important crop."


'/>"/>

Contact: Richard Hund
rhund@botany.org
314-577-9557
American Journal of Botany
Source:Eurekalert

Related biology news :

1. Researchers find the earliest evidence of domesticated maize
2. Early origins of maize in Mexico
3. Ancient Mexican maize varieties
4. Team finds an economical way to boost the vitamin A content of maize
5. If corn is biofuels king, tropical maize may be emperor
6. Simulating kernel production influences maize model accuracy
7. Transgenic maize is more susceptible to aphids
8. First all-African GM crop is resistant to maize streak virus
9. Genetic conflict in fish led to evolution of new sex chromosomes
10. Frozen assets: NIAID researchers turn to unique resource for clues to norovirus evolution
11. UAB professors book promises solution for teaching evolution without conflict
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/26/2016)... BANGALORE, India and LONDON ... Infosys Finacle, part of EdgeVerve Systems, a ... ), and Onegini today announced a partnership to ... banking solutions.      (Logo: http://photos.prnewswire.com/prnh/20151104/283829LOGO ... banks to provide their customers enhanced security to ...
(Date:4/19/2016)... April 20, 2016 The new ... a compact web-based "all-in-one" system solution for all door ... reader or the door interface with integration authorization management ... control systems. The minimal dimensions of the access control ... the building installations offer considerable freedom of design with ...
(Date:4/15/2016)... 15, 2016 Research and ... Biometrics Market 2016-2020,"  report to their offering.  , ... , ,The global gait biometrics market is expected ... the period 2016-2020. Gait analysis generates ... be used to compute factors that are not ...
Breaking Biology News(10 mins):
(Date:6/23/2016)...   EpiBiome , a precision microbiome engineering company, ... financing from Silicon Valley Bank (SVB). The financing will ... its drug development efforts, as well as purchase additional ... has been an incredible strategic partner to us – ... would provide," said Dr. Aeron Tynes Hammack , ...
(Date:6/23/2016)... ... , ... STACS DNA Inc., the sample tracking software company, today announced that ... joined STACS DNA as a Field Application Specialist. , “I am thrilled that ... of STACS DNA. “In further expanding our capacity as a scientific integrator, Hays brings ...
(Date:6/23/2016)... Ky. , June 23, 2016 ... two Phase 1 clinical trials of its complement ... placebo-controlled, single and multiple ascending dose studies designed ... pharmacodynamics (PD) of subcutaneous injection in healthy adult ... subcutaneously (SC) either as a single dose (ranging ...
(Date:6/23/2016)... June 23, 2016 ... 2016;12(1):22-8 http://doi.org/10.17925/OHR.2016.12.01.22 Published recently ... peer-reviewed journal from touchONCOLOGY, Andrew D Zelenetz ... of cancer care is placing an increasing burden ... expensive biologic therapies. With the patents on many ...
Breaking Biology Technology: