Maize 1/1 Flashcards
Maize (Zea mays) is an annual plant member of the grass ___ family
Graminea or Poaceae
First Maize plant theory (tripartite hypothesis)
maize was domesticated from an unknown wild, now extinct maize plant with features comparable to contemporary maize’s ear
First Maize plant theory (catastrophic sexual transmutation Theory )
developed by a rapid sexual transformation that condensed the branches of teosinte and positioned them in the plant’s female expression region
Tripsacum - Zea diploperennis hypothesis
History of Maize theory, as a modernised variant of the tripartite hypothesis, it suggested that maize evolved from the offspring of a cross between Z. Tripsacum and Diploperennis dactyloides
It is likely that maize was introduced to Australia with the first fleet in what year?
1788
What occured in 1947 to do with Maize crops?
The first commercial hybrid maize crops were produced based on US Corn Belt hybrid.
first Australian-bred hybrids (GH96A and GH112A) were released in what year?
1948
what is the first rust resistant maize cultivar in Australia?
QK37, 1961
ratio of dryland and irrigated maize
50/50
Producing a high-yielding grain harvest from irrigated maize in the Riverina area typically takes between ____ and ____ mm of irrigation water per ha
600mm and 1000mm (6 to 10 ML/ha)
amount of water needed for irrigation is dependent on many factors; (5)
-the variety that is used,
- the water-holding capacity of the soil,
- the effectiveness of the irrigation system, -
- evaporation, and
- rainfall that occurs directly on the crop
Flint corn
also known as Indian corn or calico corn, is a kind of maize that comes from the Zea mays var. indurate plant (Zea mays L.). The term “as hard as flint” refers to the fact that each kernel has a tough outer coating that serves the purpose of protecting the more delicate endosperm.
by med-slow flint, quick dent, and med-slow dent
contains the least amount of protein
The two different types of starch in yellow and white maize?
- Amylopectin 73%
- ## amylose 27%
Maize is classified as a C?
C4 tropical plant, superior to c3 plants, in its efficiency in using carbon dioxide, solar radiation, water, and nitrogen
C4 plants are more or less water efficient?
more water efficient.
A C4 plant performs a specialised kind of photosynthesis;
which carbon dioxide is first absorbed into a molecule containing four carbon atoms. Under conditions of high light intensity and high temperature, photosynthesis proceeds more quickly in C4 plants than it does in C3 plants. Because the stomata (pores) remain open for a shorter amount of time, this results in a more efficient use of water as compared to that of C3 plants growing in the same region.
V6 Growth stage refers to
vegetative 6 or 6 leaves emerged.
R1 Growth Stage refers to
Reproductive stage 1: Tassle emerges out the top of the plant and Silking occurs.
purpose of the tassle
to generate pollen for fertilisation through the silks.
2 thousand to 5 thousand pollen grains are produced for …..
each silk
Trichomes are…..
little hair-like projections that are found on maize silks. These trichomes capture viable pollen grains that fall onto the silks.
All silks emerge within _____ when conditions are optimal.
3-5 days
Brace roots
Aerial roots are those that originate at nodes that are located just above the soil surface and grow downward until they reach the soil. They not only provide support but also additional access to the soil’s moisture and the minerals it contains.
ideal temps for Maize?
daytime temperatures of between 25 and 30oC
A significant drop in grain production may be brought on by moisture stress over what period?
two weeks before or two weeks after silking
warm-hot nights impact on grain yield following pollination
reduces grain yield.
Maize rows are often seeded at a width of between
75 and 110 centimetres
