Genetic Variation of Photosynthetic Rate in Leaf Discs of Zea Mays L.

The photosynthetic rate (P) of maize (Zea mays L.) plants grown under growth room conditions was studied during and after a 10-day period of N starvation. The relationships between P and chlorophyll content, and P and nitrogen content were examined. Nitrogen deprivation, from the 18th to the 28th day, induced a decline of maximum photosynthetic rate, respiration and chlorophyll content; this effect was reversible. Recovery of photosynthetic capability occurred within 10 days of the resumption of nitrogen supply. Only partial recovery of chlorophyll content was recorded in the same time period. A low chlorophyll content and a relatively high photosynthetic rate were observed in N-deprived plants 4 days after the return to normal nutrient conditions. Chlorophyll efficiency was significantly greater in N-deficient than in control plants for approximately 1 wk, under light conditions close to saturation. Neither chlorophyll nor nitrogen content was correlated with maximum photosynthetic rate in N-starved plants. Under nitrogen deprivation, chlorphyll activity and leaf senescence (as measured by photosynthetic decline) appeared to be regulated independently.Key words: Nitrogen content, nitrogen deficiency, nitrogen stress, respiration, Zea mays L.

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Genetic variation in maize (Zea mays L.) for germination and emergence at 10�C

Euphytica ◽

10.1007/bf00056585 ◽

1979 ◽

Vol 28 (2) ◽

pp. 287-295 ◽

Cited By ~ 31

Author(s):

H. A. Eagles ◽

A. K. Hardacre

Keyword(s):

Zea Mays ◽

Genetic Variation ◽

Zea Mays L

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Genetic diversity of local corn (Zea mays) cultivars from South Amarasi, Kupang District, Indonesia by Inter Simple Sequence Repeats marker

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d210348 ◽

2020 ◽

Vol 21 (3) ◽

Author(s):

Uslan Uslan ◽

NUR JANNAH

Keyword(s):

Genetic Diversity ◽

Zea Mays ◽

Genetic Variation ◽

Genetic Distance ◽

Simple Sequence Repeats ◽

Zea Mays L ◽

Sample Collection ◽

High Genetic Diversity ◽

Inter Simple Sequence Repeats ◽

Simple Sequence

Abstract. Uslan, Jannah N. 2020. Genetic diversity of local corn (Zea mays) cultivars from South Amarasi, Kupang District, Indonesia by Inter Simple Sequence Repeats marker. Biodiversitas 21: 1208-1214. Corn (Zea mays L.) is one of the most important food crops in Indonesia. However, the studies described their genetic variation is relatively poor. Therefore, the aim of this study was to analyze the genetic diversity of local corn cultivars from South Amarasi, Kupang District, East Nusa Tenggara (NTT), Indonesia using ISSR markers. The sampling was conducted in 4 different sites in Sub-district of Amarasi, Kupang District. A total of 11 corn cultivars from Sub-district of South Amarasi was collected. DNA isolation was performed by using CTAB Method. Clustering analysis was conducted on MSVP 3.2 software. It was shown that all ISSR-primers used (UBC 811, UBC 814 and UBC 824) were successfully produced polymorphic bands and represents the high genetic diversity of the local corn cultivars. The genetic distance index indicated that several corn cultivars from two different populations were geographically unclustered, although there are samples from several populations that have a low genetic distance. The genetic variation index also showed high genetic diversity among the populations. Further research on the exhaustive sample collection was needed to give an insight into the genetic diversity of local corn cultivars (Zea mays L.) from South Amarasi, Indonesia. Please write implementation of this research

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Habilidad combinatoria de 8 líneas élites dominicanas de maíz (Zea Mays L.)

Agronomía Mesoamericana ◽

10.15517/am.v4i0.25169 ◽

2016 ◽

Vol 4 ◽

pp. 65

Author(s):

José Richard Ortiz ◽

Pedro Comalat Rodes

Keyword(s):

Zea Mays ◽

Genetic Variation ◽

Grain Yield ◽

Combining Ability ◽

Zea Mays L ◽

Inbred Lines ◽

Additive Genetic Variation

Twenty eight inter-crosses from a diallel set of 8 Dominican inbred lines of maize were evaluated in 1990. The specific objectives were to determine general(gca) and specific (SCA) combining ability and to predict the best two and three-way hybrids. The inheritance of yield was determined by diaIlel analysis. General and specific (sca) combining ability and specific mean squares were statistically significant in yield, being the additive genetic variation much larger than the non additive variation. The parental T66 and NO3 showed the highest gca values and DK12xT66 (9.02 t/ha),NO2xNO3 (8.57t/ha) and DK12xT66 (8.36 t/ha) the best sca values. The results partially agree with previous studies. The best three and two way hybrids predictions were (NO3xT66)x NO3 and(NO2xT66) (NO3xDK14) with grain yield of 8.80 and 8.30 t/ha.

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EFFECT OF TEMPORARY N STARVATION IN MAIZE ON LEAF SENESCENCE

Canadian Journal of Plant Science ◽

10.4141/cjps85-108 ◽

1985 ◽

Vol 65 (4) ◽

pp. 819-829 ◽

Cited By ~ 9

Author(s):

P. GIRARDIN ◽

A. DELTOUR ◽

M. TOLLENAAR

Keyword(s):

Zea Mays ◽

Leaf Area ◽

Chlorophyll Content ◽

Leaf Senescence ◽

Photosynthetic Rate ◽

Zea Mays L ◽

Deprivation Period ◽

N Starvation ◽

Maize Plants ◽

Green Leaf Area

A prerequisite for an informed strategy regarding nitrogen application in maize (Zea mays L.) is a knowledge of the physiology of plant responses to nitrogen. This study consisted of two experiments on maize plants grown in pails. One experiment was conducted in controlled-environment growth rooms, the other was conducted in the field. N-deficient and control maize plants were evaluated for photosynthetic rate (P), chlorophyll content (CC), nitrogen content, and green leaf area; comparisons between these four parameters were made. During N starvation, rate of senescence (i.e. decrease in green leaf area) of the old leaves was higher in N-deprived plants than in control plants. P and CC of all leaves in the N-deficient treatment decreased during nitrogen withdrawal. After the deprivation period, when the plants were resupplied with N, senescence was delayed relative to control plants. The increase of CC in treatment plants was slower than the recovery of photosynthetic rate; in fact, CC was a poor indicator of photosynthetic activity. The delay in leaf senescence corresponded with regreening in leaves of N-deprived plants following N addition. This delay could be partly explained by an overcompensation in plant N requirement involving both a rapid increase in P, and a slower increase in CC. The effects of resupplying plants with nitrogen following a N-deprivation period lead us to believe that the observed leaf yellowing is actually a premature senescence which is reversible, and that a low N content is not the single causal factor of senescence.Key words: Chlorophyll content, leaf area, photosynthetic rate, Zea mays L.

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