News Video | Policy | GPs | Hospitals | Medical | Mental Health | Welfare | Search

 


Nature Provides Pest Resistance - HortResearch

Nature has beaten the scientists at their own game by bestowing durable pest and disease resistance to several apple types. The challenge for the scientists is to breed commercial varieties from these.

Resistance for commercial apples is the objective for a determined scientist Vincent Bus, working at HortResearch's Hawke's Bay site. Mr Bus is searching for genes conferring resistance to several apple pests and diseases. Many thousands of seeds from old apple varieties and crab apples, including wild apples from Kazakhstan, have been grown and tested for resistance, mainly to black spot, but also for other nasties like fire blight, powdery mildew and woolly apple aphid.

Crab apples carry genes that confer immunity, and because there usually is only one gene involved, it is easy to use them for breeding. Some were imported via France and some via the USA, but most actually have their origins in Russia, China or Japan.

Eating apples are believed to have originated in Kazakhstan and HortResearch has material gathered from there during expeditions in 1993, 1995 and 1996, lead by Dr Phil Forsline of the USDA. Plants grown from seeds collected in 1993 are starting to fruit now and have already provided a number of new sources for resistance.

Of the 2500 seed from the 1995 and 1996 Kazakhstan expeditions, about 25 percent have shown resistance to black spot.

Using the Kazakhstan material has major advantages. The fruit is already large and has a fair eating quality. And it appears that nature has beaten the scientists to durable resistance and has already "pyramided" resistance genes into some of the germplasm (genetic material). Preliminary information coming from the USA shows that some of these accessions already have three or four resistance genes to black spot alone.

"The whole theme of my breeding programme is to bring different types of resistances together. There are eight or nine known major resistance genes to black spot to date, and the idea is to put different types together and make a more durable resistance," said Mr Bus.

"It would then be a lot harder for black spot to overcome that resistance. By bringing different types of resistance together into one variety, we effectively have several weapons in one to fight disease," he said.

But the next stage is to put that resistance into popular commercial varieties. Mr Bus said that using crabs it has taken three to five generations to get to the stage of gene pyramiding, with the Kazakhstan material it might only take two generations to the final product, new cultivars with durable resistances.

ENDS

© Scoop Media

 
 
 
 
 
Culture Headlines | Health Headlines | Education Headlines

 

NZ On Air TV Funding: More Comedy Comes Out Of The Shadows

Paranormal Event Response Unit is a series conceived by Jemaine Clement and Taika Waititi as a TV spin-off from their highly acclaimed feature film What We Do In The Shadows. More>>

ALSO:

Mars News: Winners Announced For The 2016 Apra Silver Scroll Awards

Wellington singer-songwriter and internationally acclaimed musician Thomas Oliver has won the 2016 APRA Silver Scroll Award with his captivating love song ‘If I Move To Mars’. More>>

ALSO:

Scoop Review Of Books: Salt River Songs by Sam Hunt

Colin Hogg, a longtime comrade of Sam, writes in his Introduction that, ‘There is a lot of death in this collection of new poems by my friend Sam Hunt. It’s easier to count the poems here that don’t deal with the great destroyer than it is to point to the ones that do.’ More>>

Electronica: Restoring The World’s First Recorded Computer Music

University of Canterbury Distinguished Professor Jack Copeland and UC alumni and composer Jason Long have restored the earliest known recording of computer-generated music, created more than 65 years ago using programming techniques devised by Alan Turing. More>>

ALSO:

Scoop Review Of Books: Almost Getting Away With Murder

The Black Widow by Lee-Anne Cartier: Lee-Anne Cartier is the sister of the Christchurch man found to have been murdered by his wife, Helen Milner, after an initial assumption by police that his death, in 2009, was suicide. More>>

Howard Davis: Triple Echo - The Malevich/Reinhardt/Hotere Nexus

Howard Davis: The current juxtaposition of works by Ralph Hotere and Ad Reinhardt at Te Papa perfectly exemplifies Jean Michel Massing's preoccupation with the transmigration of imagery in a remarkable triple echo effect... More>>

Get More From Scoop

 
 

LATEST HEADLINES

 
 
 
 
Health
Search Scoop  
 
 
Powered by Vodafone
NZ independent news