Navigation Links
Secrets in a seed: Clues into the evolution of the first flowers
Date:9/14/2009

Approximately 120-130 million years ago, one of the most significant events in the history of the Earth occurred: the first flowering plants, or angiosperms, arose. In the late 1800s, Darwin referred to their development as an "abominable mystery." To this day, scientists are still challenged by this "mystery" of how angiosperms originated, rapidly diversified, and rose to dominance. (See the January 2009 issue of the American Journal of Botany at www.amjbot.org/content/vol96/issue1.)

Studies of key features of angiosperm evolution, such as the evolution of the flower and development of the endosperm, have contributed to our current understanding of relationships among the early families of flowering plants. Examining the development of seeds and embryos among early angiosperms may help to improve our understanding of how flowering plants evolved from the nonflowering gymnosperms.

A recent study by Dr. Paula Rudall and colleagues published in the September issue of the AJB (www.amjbot.org/cgi/content/full/96/9/1581) explores a piece of this mystery: the microscopic anatomy of seed development in Trithuria, a genus in the plant family Hydatellaceae, thought to be one of the earliest families of angiospermsthe so-called "basal angiosperms."

Rudall and colleagues' observations of the development of the embryo and endosperm (tissue that surrounds the embryo and provides nutrition) in Trithuria suggest that double fertilization occurs. Double fertilization is a unique feature of flowering plants where one sperm nucleus unites with the egg, producing the embryo, while another sperm nucleus unites with a separate nucleus from the female, producing the endosperm. The endosperm is divided into two regionsthe micropylar and chalazal regions.

In Trithuria, the cells of the micropylar region divide man
'/>"/>

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

Page: 1 2

Related biology news :

1. Uncovering the secrets of ulcer-causing bacteria
2. Drug-proof zebrafish reveal secrets of addiction
3. Genetic secrets of date palm unlocked by researchers at Weill Cornell Medical College in Qatar
4. Yale researchers uncover secrets of salmonellas stealth attack
5. Diet secrets of the Royals
6. Scientists unlock the secrets of C. difficiles protective shell
7. Caltech researchers help unlock the secrets of gene regulatory networks
8. DNA testing may unlock secrets of medieval manuscripts
9. Expeditions reveal gulf of Californias deep sea secrets, as well as human imprints
10. Uncovering secrets of life in the ocean
11. Landmark study unlocks stem cell, DNA secrets to speed therapies
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/7/2015)... , July 7, 2015  Based on ... Frost & Sullivan recognizes Credence ID, LLC with ... Entrepreneurial Company of the Year Award. Credence ID ... aid in its mission of offering enrollment and ... globally. As Credence ID was formed by experts ...
(Date:7/2/2015)... , July 2, 2015 Fingerprint ... FPC1025, FPC1035, FPC1145 and FPC1155 from the distributor World Peace ... of FPC,s distributors in Asia . Deliveries ... The sensors will be used by smartphone manufacturers in ... is included in the communicated revenue guidance of approximately 2,200 ...
(Date:6/26/2015)... , June 26, 2015 ATL Technology, LLC, a ... with specialties in single use solutions, headquartered in ... Inc. (a California corporation with locations ... San Jose, Costa Rica ). This ... Rica with ATL Technology,s existing facility in ...
Breaking Biology News(10 mins):Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 2Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 3Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 4Frost & Sullivan Acknowledges the Distinctive Customer-focused Attributes of Credence ID's Mobile Biometric Product Suite 5FPC Receives Order for Touch Fingerprint Sensors of 268 MSEK 2ATL Technology Announces Acquisition of MedConx, Inc. and Expanded Global Footprint 2
... from two research teams at the Polytechnic Institute of ... be used to understand and influence the complex swimming ... Porfiri, associate professor of mechanical and aerospace engineering at ... PLOS ONE . These studies are the ...
... scent marking to advertise their territory they urinate at ... It has been suggested that markings serves to attract females ... males, scent marks appear to be a secondary sexual trait, ... mate. When male house mice are subordinate or sick, for ...
... regarded as a fully-paid up member of the junk food ... versions found on supermarket shelves or delivered to your door ... and a little cheese, combined to form a traditional, healthy ... new members to their posse salt and saturated fat. ...
Cached Biology News:The secret's in the (robotic) stroke 2The secret's in the (robotic) stroke 3Scent marking 2Pizza perfect! A nutritional overhaul of 'junk food' and ready-meals is possible 2Pizza perfect! A nutritional overhaul of 'junk food' and ready-meals is possible 3
(Date:7/30/2015)... , CA (PRWEB) , ... July 30, 2015 ... ... the successful completion of a field clinical study of its canine osteoarthritis stem ... together with Aratana Therapeutics (Kansas City, KS) and will be marketed in the ...
(Date:7/30/2015)... , Inc. (NASDAQ: SNMX ), a leading company ... commercialize novel flavor ingredients for the food, beverage, and ... second quarter 2015. "Moving into the ... achieve our commercial and financial goals," stated John Poyhonen, ... our last quarterly earnings report, our two partners have ...
(Date:7/30/2015)... Ascendis Pharma A/S (Nasdaq: ASND ... TransCon technology to address significant unmet medical needs, ... Phase 2 study to evaluate the safety and ... treatment-naïve, pre-pubertal children with growth hormone deficiency, or ... the top-line results from our Phase 2 pediatric ...
(Date:7/30/2015)... July 30, 2015  Discovery Laboratories, Inc. (Nasdaq: ... received the second $1.0M tranche under a previously ... grant valued at up to $3.0 million to ... surfactant as a potential medical countermeasure to mitigate ... was awarded an initial $1.0 million under this ...
Breaking Biology Technology:VetStem Biopharma Successfully Completes Large Milestone Efficacy Study for its Flagship Canine Osteoarthritis Stem Cell Product 2VetStem Biopharma Successfully Completes Large Milestone Efficacy Study for its Flagship Canine Osteoarthritis Stem Cell Product 3SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 2SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 3SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 4SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 5SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 6SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 7SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 8SENOMYX ANNOUNCES SECOND QUARTER 2015 FINANCIAL RESULTS 9Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 2Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 3Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 4Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 5Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 6Ascendis Pharma A/S Announces Positive Top-line Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 7Discovery Labs Receives $1.0 million under an SBIR Grant in Continuing Support of the Development of Aerosolized KL4 Surfactant to Address Radiation-Induced Lung Injury 2Discovery Labs Receives $1.0 million under an SBIR Grant in Continuing Support of the Development of Aerosolized KL4 Surfactant to Address Radiation-Induced Lung Injury 3
... Germany, March 17 The rating,agency Moody,s has ... Ba3 to,Ba2 with "Outlook stable"., As a ... and its,refinancing possibilities are substantially enhanced. Moody,s justifies,this ... profile as,a result of successful acquisitions and in ...
... MASI ), the inventor of Pulse CO-Oximetry and Measure-Through,Motion ... scheduled,to present at the Citi Investment Research 5th Annual Small ... NV on Wednesday, March,19, 2008 at 2:25 p.m. PT. Joe ... Vice President and CFO, will be presenting., A live ...
... 19 at 10:00 AM EDT, CEDAR KNOLLS, N.J., ... will host a conference call discussing,its financial results for ... Wednesday, March 19, at 10:00 AM EDT., The ... through the,company,s Web site at: http://www.emisphere.com . The ...
Cached Biology Technology:Moody's Raises Rating for Gerresheimer 2Masimo to Present at Citi Investment Research 5th Annual Small & Mid-Cap Conference 2Emisphere Technologies, Inc. Announces Conference Call for 2007 Fourth Quarter and Year End Financial Results 2
... DNA Kit is designed for fast and ... plant cells and tissues. The bead beating ... DNA isolation procedures such as CTAB, phenol, ... alcohol precipitation is not necessary - purified ...
The filter 530DF28 for the Molecular Imager FX is a band pass filter for ECL Plus, AttoPhos, SYBR Green, Alexa Fluor 488, FITC, Cy2, and Pro-Q Emerald dyes....
... method for labeling DNA breaks to detect ... contains all the key reagents required for ... negative control cells for assessing reagent performance; ... individual steps in the assay; terminal deoxynucleotidyl ...
... Kit is a two color staining method ... DNA to detect apoptotic cells by flow ... reagents required for measuring apoptosis in cells ... assessing reagent performance; washing, reaction and rinsing ...
Biology Products: