9 RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook pollen sac Encyclopedia Wikipedia n. One of the chambers of an anther or a male cone in which pollen is produced; the microsporangium of a seed plant. ...
So let's look at how this works in your typical flower. Pollen grains are created through the process ofmeiosis, during which cells divide and grow in number. The grains of pollen are often located in pollen sacs on the ends of thestamen(the male parts of the flower), which typically ...
“With our study, we show that there are physical effects of marijuana smoking on the lungs and that cigarette smoking and marijuana smoking may have a combined damaging effect on the lungs,” Kang added. Even though weed is one of the most widely used psychoactive substances in the world, ...
Reports on a case of pollen transfer on birds' tongues involving the flowers of Microloma sagittatum, a member of the milkweed family, and sunbirds. First evidence for pollen transfer on the tongues of birds; Features of the Microloma sagittatum flowers which prevent insects from carrying out...
In this case, however, one would expect that on the basis of the gametophytic gene programme being already switched on, different gametophytic structures are formed. Possibly, the for- marion of pollen embryo sacs, i.e. female gametophytes (Nemec 1898), could result from such an event. ...
sseellffeedd——sshhoowweeddtthhaatt((xi) the within- and between-tree variances attaching to ovule Ccoouunnttss iinn incompatible selfings and crosses were always similar in magnitude; (2) the actual frreeqquueennccyyddiissttrriibbuuttiioonnooffccoonntitninggeennccyy-x-22 vvaalluueess ...
It is also an excellent gene pool in modern rice breeding because it possesses various outstanding traits, including resistance to bacterial blight disease, weed suppression effects, rhizomes, high biomass production on poor soils and high nitrogen use efficiency (Song and Ronald, 1995; Rodenburg and...
sacs in the F1hybrids were defective during the functional megaspore formation stage. Most notably, nearly half of the male or female gametes were aborted in heterozygotesS40iS40l, regardless of their genotypes. Thus,S40was indicated as a one-locus sporophytic sterility gene controlling both male...
General agronomic practices such as weed control and irrigation were carried out ad libitum and no insecticide was applied. 2.2. Insect Sampling We sampled for specific pollinators (honey bees, bumble bees, and sweat bees) that were observed and documented on industrial hemp (Figure 1), using ...
General agronomic practices such as weed control and irrigation were carried out ad libitum and no insecticide was applied. 2.2. Insect Sampling We sampled for specific pollinators (honey bees, bumble bees, and sweat bees) that were observed and documented on industrial hemp (Figure 1), using ...