Tomato leaf comparisons

I wrote an earlier post comparing regular leaf tomatoes with potato leaf tomatoes.  This summer I also grew some woolly leaf tomatoes, so thought I would show some comparisons of these three tomato leaf types.

Regular leaf tomatoes are good, and there are heaps of types.  I like the look of potato leaf tomatoes.  The one below has relatively small leaves, I grow a few types with leaves that are far larger.  I imagine they would have issues growing in wet climates as they would have less air flow, but I live in dry climates so this is just an educated guess.

I love woolly leaf tomatoes, they look and feel amazing.  My kids can hardly keep their hands off the leaves.  Woolly leaf tomatoes would be well suited to a sensory garden!  They seem to cope better with heat, and they seem to do ok with less water than other varieties, but to be honest I don't know if they actually cope better or if I am just imagining it. 

Regular tomato leaf and woolly tomato leaf

Regular Leaf (often abbreviated RL)

This is the typical leaf type that most people are familiar with, most varieties of tomato have regular leaf.  The leaf edges are serrated quite a bit.  There are a lot of variations on this basic theme in terms of the width/length of leaf depending on the specific variety, climate and growing methods.  Some leaves are very narrow and are sometimes called 'dissected', others are wispy or droopy or look like the foliage of a carrot.  These are easily recognised as regular leaf tomatoes.  They carry at lest one dominant allele C.

Left to right: Regular leaf, woolly leaf, potato leaf

Potato Leaf (often abbreviated PL)

These leaves usually have very few interruptions of the leaf edge.  They are fat and large leaves, some varieties have huge leaves while others are far smaller.  Newly germinated seedlings sometimes don't show their PL nature until they are a few inches tall, others show it as soon as they grow their true leaves.  PL leaves often have a thicker cuticle than RL leaves or a higher density of trichomes (which are tiny little hairs on the leaf).  Leaf shape can be different on a single plant with some showing more or less smooth edges, all of this is normal for PL. Potato leaf is recessive, so any potato leaf tomatoes must carry two copes of the c allele.

Underside of leaves: Regular leaf, woolly leaf, potato leaf

Woolly Leaf tomato, sometimes called Angora Leaf
These are pretty easy to recognise as the leaves, stems, and fruits are fuzzy.  There are several different alleles that can cause the woolly trait, most of which are dominant and most are homozygous lethal.  This meant they would only carry one copy of the dominant allele (if they carry two they do not survive).  Another rarer form of this allele is dominant but it is homozygous viable and heterozygous intermediate, meaning they can carry one copy and be a little fluffy or two copies and be extra fluffy.

I really love woolly leaf tomatoes.  The variety I grow appears to carry the dominant yet homozygous viable allele for woolly foliage/stems/fruit.  A cross between regular leaf and woolly leaf produces a leaf that is only a little more woolly than normal.  It is difficult to tell that the cross carries the woolly allele at all.

Regular leaf top left, woolly leaf top right, cross of the two under/between them

Woolly leaf tomatoes tend to have fuzzy fruit

Woolly leaf allele is on a different locus to potato leaf, so it is possible to have regular leaf woolly plants, and potato leaf woolly plants.  It is also possible to have any of these all in green or any of them can be variegated.

I think I am going to have to do some breeding with micro dwarfs with the aim of a woolly micro dwarf tomato.  Time will tell what the future brings, but at this stage it looks promising.