Rahasia bagaimana tanaman mengatur produksi vitamin C mereka --T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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Rahasia bagaimana tanaman mengatur  produksi vitamin C mereka 

Dalam regulasi vitamin C , adalah tingkat vitamin C sendiri dalam setiap sel tanaman yang memutuskan apakah RNA berubah menjadi protein yang membuat vitamin C , temuan para peneliti. " Memahami mekanisme ini dapat membantu dalam program pemuliaan tanaman untuk menghasilkan tanaman tanaman hardier dan meningkatkan kesehatan manusia karena anemia kekurangan zat besi adalah bentuk paling umum dari kekurangan gizi di seluruh dunia , " jelas salah satu ahli .....read more

Secret of how
plants regulate their vitamin C production revealed

Date:

March 12, 2015

Source:

Queensland University
of Technology

Summary:

In the regulation of
vitamin C, it is the level of vitamin C itself in each plant cell that decides
whether RNA turns into the protein which makes vitamin C, researchers have
found. "Understanding these mechanisms may help in plant breeding programs
to produce hardier plant crops and improve human health because iron deficiency
anemia is the most common form of malnutrition worldwide," explains one
expert.

......................

A QUT scientist has
helped unravel the way in which plants regulate their levels of vitamin C, the
vitamin essential for preventing iron deficiency anemia and conditions such as
scurvy.

Professor Roger Hellens, working with Dr William Laing from New Zealand's
Plant and Food Research, has discovered the mechanism plants use to regulate
the levels of Vitamin C in each of their cells in response to the environment.

"Understanding these mechanisms may help in plant breeding programs to
produce hardier plant crops and improve human health because iron deficiency
anemia is the most common form of malnutrition worldwide," Professor
Hellens, from QUT's Institute of Future Environments.

"This discovery will also help us to understand why some plants such
as the Kakadu plum are able to accumulate super-high levels of vitamin C.

"Vitamin C is important in our diet because it enables more iron,
which carries oxygen to our cells, to be taken up and absorbed.

"We humans gradually lost the ability to produce our own vitamin C
thousands of years ago because it was so abundant in our hominid ancestors'
largely fruit diet.

"As we know, fruit can be higher in vitamin C than leafy vegetables so
we can now study why fruit is so high and why some fruits make huge
amounts."

Professor Hellens said plants responded to factors in the environment like
extreme light or drought by producing vitamin C, a powerful antioxidant, to
protect themselves from damage.

"Each cell assesses whether it should produce more of the antioxidant
which would absorb the energy from the high levels of light or stop the
damaging oxidative process in amount the a dehydrated plant.

"In vitamin C regulation it is the ascorbate molecules which interact
with a critical enzyme in the biochemical pathways to make vitamin C. Plants
can move the level of ascorbic acid between cells as needed."

Professor Hellens said plants had two ways to regulate cell processes.

"One way is during transcription when DNA is turned into the messenger
molecule RNA, the molecule that distinguishes cells into different types of
tissue. The second way is to regulate while turning RNA into an enzyme that
makes vitamin C.

"So if a cell wants to increase its level of vitamin C it's generally
got two ways to do it -- and we've discovered vitamins C uses the second
method, and in an unexpected way.

"We discovered it's not whether the cell is making the RNA but whether
the RNA is converted into a protein that is the deciding mechanism.

"It's very interesting because we found it was the level of vitamin C
itself in each cell that decides whether RNA turns into the protein which makes
vitamin C."







Story Source:

The above story is based on materials provided by Queensland University of
Technology. Note: Materials may be edited for content and length.







Journal Reference:

1.    Roger P. Hellensa et al. An
Upstream Open Reading Frame Is Essential for Feedback Regulation of Ascorbate
Biosynthesis in Arabidopsis. The Plant Cell, March 2015
DOI: 10.%u200B1105/%u200Btpc.%u200B114

http://www.sciencedaily.com/releases/2015/03/150312100730.htm

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