How to do seed longevity experiments

The article “Seed longevity phenotyping: recommendations on research methodology,” by Fiona Hay and others, is now freely available online. Read the whole thing, and note the use of DOIs, if you’re thinking of phenotyping seedlots for longevity or storability. But here’s the bottom line, just to whet you appetite:

  • Use ageing conditions that are appropriate to the potential downstream use of the findings. Ideally such conditions should be standardized to enable comparisons across studies and perhaps, species.
  • Take enough samples for germination testing such that a survival curve can be fitted to the data and appropriate parameters determined.
  • Specify if seeds were de- or adsorbing moisture; determine the MC of the seeds if they are placed in a controlled-RH environment (e.g. over a saturated salt solution).

In an earlier Brainfood I said it was behind a paywall, which I swear it was when I checked, but that’s not the case anymore, thank goodness.

An experiment on cassava degeneration, Twitter-style

IITA plant virologist James Legg asks:

Cassava mosaic virus disease & Cassava brown streak virus disease constrain production throughout East & Central Africa, but do the effects get worse if farmers keep recycling planting material?

Yes, right?

Well, it’s more complicated than that. Spoiler alert:

1. Degeneration is most clear in resistant varieties as it happens slowly
2. Virus-free planting material gives greater yield gains than extreme resistance
3. BUT, virus-free material has no value for highly susceptible varieties

But read how they got there.

Brainfood: Makapuno, Middle Eastern dogs, Date palm origins, Speedy NUS, Red apples, Apple characterization, Phenotyping double, Assisted migration & pathology, Soya diversity, Sustainable intensification, Seed research, Cucurbita history, Potato value chains, Livestock ES

DOI DIY

Remember when we told you that you could comment on the draft guidelines for the use of DOIs in plant genetic resources conservation and use? Well, I hope you did, because now they’re out, thanks to the Seed Treaty’s work on developing a Global Information System. Here’s one of the authors, in case you were wondering. And on the same website, that of the Genebank Platform, you can also find out about how his, and the other CGIAR genebanks, are implementing DOIs.