Organic management promotes natural pest control through altered plant resistance to insects.

Reduced insect pest populations found on long-term organic farms have mostly been attributed to increased biodiversity and abundance of beneficial predators, as well as to changes in plant nutrient content. However, the role of plant resistance has largely been ignored. Here, we determine whether host plant resistance mediates decreased pest populations in organic systems and identify potential underpinning mechanisms.

Correction to: An efficient and reproducible - mediated transformation method for hexaploid wheat ( L.).

[This corrects the article DOI: 10.1186/s13007-019-0503-z.].

An efficient and reproducible -mediated transformation method for hexaploid wheat ( L.).

Background: Despite wheat being a worldwide staple, it is still considered the most difficult to transform out of the main cereal crops. Therefore, for the wheat research community, a freely available and effective wheat transformation system is still greatly needed.

Results: We have developed and optimised a reproducible -mediated transformation system for the spring wheat cv 'Fielder' that yields transformation efficiencies of up to 25%.

Effects of an intracanal glass ionomer barrier on coronal microleakage in teeth with post space.

Bacterial microleakage of the remaining gutta-percha in teeth prepared for post space with and without the use of an intracanal glass ionomer barrier was evaluated. Forty distal roots of mandibular molars were instrumented, obturated with gutta-percha and AH Plus sealer, and post spaces created. Teeth were divided as follows: Group I, 3 mm of gutta-percha; group II, 4 mm of gutta-percha; group III, 2 mm of gutta-percha plus 1 mm of Vitrebond; and group IV, 3 mm gutta-percha plus 1 mm Vitrebond.